Cisco :: 2821 - VPN And Remote VoIP Dropping
Nov 21, 2011
I have a remote user who currently has a Cisco VoIP phone that connects into our network via TFTP. He informs me that the phone drops several times throughout the day, with an occasional drop in VPN from time to time. His router has the most current firmware, set QoS rules priortizing the phone and VPN, and decreased the MTU rate, yet he still experiences these drops. He used a VoIP phone from his last job, and never experienced a drop.
A little info of our current setup:
Cisco 2821 Intergrated Services Router, with CUCM version 7.1.3.30000-1
Cisco ASA 5510 software version 8.2(4)
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Apr 3, 2013
Would the above router be a good choise for a home office setup for use with WAN speeds upto 30Mbps and VOIP? Any other.
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Mar 24, 2013
I use tracking objects aroung the organization where I work to monitor WAN and VPN connections and add/remove routes based on the state of the object. I'm having 2 locations that are constanty going up and down and I've been troubleshooting and monitoring for the last few weeks without finding anything. I've been incrementing the timeout for the SLA and it seems like this is working a little (less overall drops) but the drops still occur. Our ISP reports no issues and we see no issues internally on the circuits. Just out of curiosity could this be some kind of IOS bug or hardware malfunction? The router logs are full of these:
Mar 21 16:18:33: %TRACKING-5-STATE: 2 ip sla 2 reachability Up->Down
Mar 21 16:18:38: %TRACKING-5-STATE: 2 ip sla 2 reachability Down->Up
Mar 21 17:24:14: %TRACKING-5-STATE: 2 ip sla 2 reachability Up->Down
Mar 21 17:24:19: %TRACKING-5-STATE: 2 ip sla 2 reachability Down->Up
[code]....
The IOS version of the router I took these from is 151-4.M6 advanced IP services and it's a 2821 router.
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Feb 13, 2013
I have a strong internet signal with good SNR coming out of my cable modem, then a nice short 3ft cable going to my linksys VOIP router (I think it's a SPA 2102). Whether I have anything downstream plugged in or not, the "phone" light on the VOIP router goes off every once in a while and when I check I find that I've lost both dial tone and Internet - basically everything downstream of the VOIP router. Have tried every variation on configuration you can imagine (feeding just one phone, feeding the entire phone wiring to the house, nothing at all plugged into the phone jack, no computers downstream plugged in, replaced all the cables, ...). I've replaced BOTH the cable modem and the linksys VOIP router and the problem continues. My cable company says my signal is fine. They suggested a signal amplifier but the coax comes straight to the modem, no splitter, and I'm always seeing 6-7dBmV. My phone company says their router must be losing signal upstream and refusing to reconnect, especially now that we've tried replacing their VOIP router with no change. Any chance I got two 'bad' routers in a row? Not sure what they did for setup parameters. I'm not particularly tech-savvy but have read a lot since seeing these issues, have run my own ping and tracert checks and everything seems to be wonderful... but then most of the time everything IS fine. When I have phone it's crystal clear and when I have internet it's nice and fast. I sometimes go 24hrs or so without a drop, but other times I'm resetting 2-3x in a couple of hours. All I do is power off the VOIP router and back on and everything is fine, for a while. After first getting VOIP things were fine for 4-6 weeks.
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Jul 8, 2008
I recently purchased a rvs 4000 wired linksys router for my business. Everything works great with the exception of my VOIP PBX server. I can receive a call and make a call one at a time. If a second line rings in and is picked up the first call and the second go dead air. I am sure that it is a security setting somewhere that I just can't seem to figure out. I sure would like to get some direction on this.
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Jan 25, 2012
I'm looking for a VoIP solution for one of our remote sites.I'd like to keep it self contained and not attached to our current Cisco Call Manager.I had a couple sites running Asterisk from EvolutionPBX (URL), but it appears they've gone out of business.I've come across many different vendors for a solution, but of course they all claim to be the best. I'm just curious what others are running.What I really liked about Evolution PBX was how easy it was to setup.I basically need about 25 to 30 extensions, after hours voicemail, and a hunt group.
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Feb 24, 2011
I have an ASA 5510 and would like to extend one of the subnets behind this ASA out to my house that has a cable modem, a wireless router/switch and then behind that I have a 2821 router. I've been reading and it looks like L2TP may be the way to go but can't find and config examples. Again, I would like to securely extend one and nail up a permanent connection of one of the VLANs in the production network all the way into my house using my cable modem and the 2821. Any config examples! Also, any IOS recommendations for the 2821. Lastly, does L2TP look like the way I need to go? I'm attaching a very basic Visio diagram of what I'm trying to do.
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Sep 12, 2012
We have two ASA 5500 series Firewalls running 8.4(1). One in New York, another in Atlanta.They are configured identically for simple IPSecV1 remote access for clients. Authentication is performed by an Radius server local to each site.
There are multiple IPSec Site-to-Site tunnels on these ASA's as well but those are not affected by the issues we're having.First, let me start with the famous last words, NOTHING WAS CHANGED.
All of a sudden, we were getting reports of remote users to the Atlanta ASA timing out when trying to bring up the tunnel. They would get prompted for their ID/Password, then nothing until it times out.Sames users going to the NY ASA are fine.After extensive troubleshooting, here is what I've discovered. Remote clients will authenticate fine to the Atlanta Firewall ONLY IF THEY ARE USING A WIRED CONNECTION.
If they are using the wireless adapter for their client machine, they will get stuck trying to login to Atlanta.These same clients will get into the New York ASA with no problems using wired or wireless connections.Windows 7 clients use the Shrewsoft VPN client and Mac clients use the Cisco VPN client. They BOTH BEHAVE the same way and fail to connect to the Atlanta ASA if they use their wireless adapter to initiate the connection.
Using myself as an example.
1. On my home Win 7 laptop using wireless, I can connect to the NY ASA with no issues.
2. The same creditials USED to work for Atlanta as well but have now stopped working. I get stuck until it times out.
3. I run a wire from my laptop to the FiOS router, then try again using the same credentials to Atlanta and I get RIGHT IN.
This makes absolutely no sense to me. Why would the far end of the cloud care if I have a wired or wireless network adapter? I should just be an IP address right? Again, this is beyond my scope of knowledge.We've rebuilt and moved the Radius server to another host in Atlanta in our attempts to troubleshoot to no avail. We've also rebooted the Atlanta Firewall and nothing changed.
We've tried all sorts of remote client combinations. Wireless Internet access points from different carriers (Clear, Verizon, Sprint) all exhibit the same behavior. Once I plug the laptops into a wired connection, BAM, they work connecting to Atlanta. The New York ASA is fine for wired and wireless connections. Same with some other remote office locations that we have.
Below I've detailed the syslog sequence on the Atlanta ASA for both a working wired remote connection and a failed wireless connection. At first we thought the AAA/Radius server was rejecting us but is shows the same reject message for the working connection. Again, both MAC and Windows clients show the same sequence.Where the connection fails is the "IKE Phase 1" process.
-------------------------------------------------------------------------------------------------------------------------
WORKING CONNECTION
-------------------------------------------------------------------------------------------------------------------------
%ASA-6-713172: Automatic NAT Detection Status: Remote end is|is not behind a NAT device This end is|is not behind a NAT device
NAT-Traversal auto-detected NAT.
%ASA-6-113004: AAA user aaa_type Successful: server = server_IP_address, User = user
%ASA-6-113005: AAA user authentication Rejected: reason = string: server = server_IP_address, User = user
[code]...
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Mar 9, 2011
On wireless (lenovo tabletx61) I cannot connect through the intranet - no problem connecting through internet. When I manage to connect through intranet connection is dropped quite often.No problem connecting via Ethernet cables.
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Jan 17, 2012
I have 4 remote sites that are using a ASA as thir firewall / router. I'm setting up a full mesh VPN between all the sites. One of the sites have a UC500 and the other sites access that UC over the VPN tunnels. I would like to set up some basic QoS for the VOIP traffic
The site that has the UC will have multiple vpn tunnles coming in from the remote sites. How will I do QoS with voice traffic on that site?
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May 21, 2013
I have a Cisco ASA 5540 running 8.2(5). When I dial a phone on the other of the the VPN the first time I get a blank after it rings(i.e when the voice mail get activated if someone picks the phone up), however works the second and consequent times i dial.
A little background. Two sites A and B connected via IPsec Tunnel. No problems in communication except for the VoIP issue. A Phone in on site A(172.17.168.x) and other on site B(192.168.103.x). Site A and Site B is connected via an IPsec tunnel on the Cisco ASA. First call fails. Second call works. Result of a packet trace is also the same. The UDP packet get drops when tried for the first time but subsequent ones pass.
First time
ASA5520# packet-tracer input inside udp 172.17.168.95 10000 192.168.3.103 10000
Phase: 1
Type: ROUTE-LOOKUP
Subtype: input
Result: ALLOW
Config:
Additional Information:
in 0.0.0.0 0.0.0.0 outside
[code].......
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Jul 2, 2012
How can I do a VoIP Install/Repair?
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Sep 9, 2012
having some issues. My basic VOIP network I can get to work no problem uner Vlan 1. But when I try tomake multiple basic networks to connect and put them in to diffrent Vlans such as Vlan 2, 3, 4 and conect them the phones now say configuering IP.
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Mar 26, 2012
We just purchased cisco 2960 for our VoIP needs and we are using polycom phones, and Phone and Computer will use same port. Since Polycom phones are capable working with CDP protocol and we are hoping to get another switch to expand VoIP network. I found easiest way of setting up each port is as following (from the cisco tutorial)
Switch#configure terminal
Switch(config)#mls qos
Switch(config)#interface fastethernet 0/1
Switch(config-if)#mls qos trust cos
Switch(config-if)#switchport voice vlan dot1p
Switch(config-if)#switchport voice vlan 10
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 20
Switch(config-if)#exit
My first question,when we are using switchport voice vlan dot1p ,I thought we instruct the switch port to use 802.1P priority tagging for voice traffic and to use the default native VLAN (VLAN 0) to carry all traffic.Do I still need to create a Vlan 20 for data and Vlan 10 for voice ?
Secondly,same tutorial adds these commands as well,Do you think for our set up, using those commands are feasible ?
Switch(config-if)#switchport priority extend trust
Switch(config-if)#priority-queue out
Switch(config-if)#spanning-tree portfast
Switch(config-if)#spanning-tree bpduguard enable
Switch(config-if)#exit
Thirdly,when we get another switch and do the same configuration for the second switch, can I use any port on Switch 1 as uplink without doing any configuration ?
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Aug 15, 2011
my config and all the show's ive run sofar tryign to figure this out, but the policy map isnt matching the traffic for some reason
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Jun 26, 2012
I have a little weird request at work. One of our offices would like to split the VOIP traffic. At that office we have a 10MB primary and 3MB backup circuit. Currently the phones are routing over the 10MB circuit. The General Manager would like to use the 3MB backup circuit for VOIP traffic. For the 3MB we have two T1 lines bundled together in a multilink. Configuration is bellow if needed
3MB Circuit
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Dec 16, 2011
I have a 887 setup as a EasyVPN server, and a 861 as an EasyVPN remote - network extension mode with split tunnelling.This works fine - I can ping and connect to machines across the tunnel.However if I setup a VOIP handset to connect across the tunnel it registers and calls work, but drop after 30secs....I know this is normally a firewall or nat problem, are easyvpns firewalled or natted?
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Oct 25, 2012
I am fairly new to Cisco, but am trying to configure a 1921 router to give higher priority to SIP/VoIP traffic (Port 5060) than everything else.The connection is only 4Mb and is getting hit hard by video streaming, I don't want to block this, just make a lower priority.Any ideas where I am going wrong?My current config is as below.The IP addresses have been changed for security reasons, but in reality are both in the same range, i.e. are both external IPs, so I am not sure if this is causing the problem. Do I need NAT for QoS to work?
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Sep 26, 2012
I am tasked to connect my VoIP phones from remote site to my corp site. Basically all remote phones will be registering into a VoIP server in corp site. I have a site to site vpn tunnel established already from remote site to corp site. My hardware includes the following:
-Cisco ASA 5505
-Cisco small business POE switch SF300 24p
-Avaya 2015p VoIP phones
Successfully Register remote VoIP phones to corporate VoIP server 10.30.18.55.I have already configured vlan1 10.30.15.0/24(inside lan) and vlan2 public int(outside Internet) which my dmz only allows 2 per my basic asa licensing.When I connect my phones and register it states "subnet conflict" unable to register.
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Dec 27, 2012
I am trying to get QoS for my VoIP system setup on several SGE2000p switches and have got a question...How do I define the ACL for RTP? As far as I can tell it will not let me enter a UDP port range for the RTP traffic... And I cant imagine creating rules for each port would be very effective either. So, how can I define an ACL to cover the RTP traffic so I can classify it?
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Dec 6, 2011
I have router cisco 2821 wit IOS version 12.4(25d) I also have Cisco AIM-VPN/SSL-2 Encryption Module for this router.I inserted this module in AIM slot 0 but can not see it. [code] What should I have to change to enable this module?
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Mar 27, 2013
I have an existing C2821 router (2 onboard GE + 1 HWIC-2FE) currently. Like to add another 1 HWIC-2FE. Saw this doc on Cisco website which states Max of 2 HWIC-2FE for Cisco2821. Want to confirm this is indeed so as another link states max of 1 HWIC-2FE.
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Jan 19, 2013
I have configured Clientless SSL VPN on 2821 router with IOS12.4//Its running fine and I am able to open local portals I have mentioned in the SSL URL List.
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Jan 24, 2011
I am encountering delays when making any calls using VOIP. I understand that there is always a delay using VOIP but not as much. I've done a bandwidth test on my network and everything seems to be Ok, we have 4 T1s with 55 Reps using it. There is nothing choking up the network.
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Apr 6, 2012
Trying to select a router that will work well networking a computer with a nettalk duo, on a limited bandwidth connection: .3/3Mbps up/down. From what little I've been able to find on this, QoS bandwidth control seems critical, yet the list of recommended routers from Nettalk seems to favor routers that don't have this feature. On the other hand, the list apparently hasn't been updated in a year and a half.
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Feb 10, 2011
Recently at my company we have started using Polycom i335 IP Phones from 8x8 inc, the thing is that while trying to use it directly through a switch it does not register with the server and I get a "url call is disabled" msg on the LCD of the Polycom. On that same switch I am using an Aastra 6755i IP phone, it is working absolutely fine, although it is using the same technology and ports.Now if I connect my laptop via wireless or if I connect a PC through wire and use ICS to share the internet and connect the Polycom to the shared Ethernet port, the Polycom works fine! On the same network Vonage works fine as well. but this Polycom only and only works via ICS?
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Mar 17, 2011
How can I connect two laptops via VOIP?
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Aug 5, 2011
Any VoIP box which has from 3 to 10 phone ports?I'm sourcing the box for a business that wants to connect about 8 phones to the box, then have the calls terminated on our partitioned platform hosted by a third party.
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Dec 9, 2010
I have a Voip application on my Windows Vista Home Premium. It is called Reliance iCall. I was not able to call from this application for a few months and so i thought there was something wrong with it. But just yesterday i thought of connecting my modem directly to the desktop and the call went through without any problem. It is only when i connect modem to computer through router that this application does not does not do anything.
What could be in this router that is blocking the calls from making a connection? There is also no setting to configure in this VoIP application. I dont know what to do. And also dont want to keep on switching modem's ethernet cable from router to computer and back.
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Nov 16, 2011
As the thread title says, I just want to gain better understanding by practising the config.
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Mar 14, 2013
Is it possible to connect an analog phone to an FXS port on a CME router and a VoIP phone to a switch connected to said router and have voice connectivity between the phones? Also, is it possible to connect an FXO port on that same CME to a RJ-11 wall jack to connect to the PSTN and be able to call that VoIP phone as well as the analog phone from my cellphone? I'm trying to tie as I read the CCNA Voice OCG.
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Jan 8, 2012
I have a cisco RV220W router used in a home environment. Recently I purchased a Siemens Gigaset A 580 IP phone. It works OK so far but I would like to optimize the configuration for VoIP traffic and apply QoS for VoIP on this router. Any guide with the recommended configuration and preferred settings of the same? I have not used QoS previously
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Mar 31, 2011
I have a Cisco 877 on an ADSL connection. QoS isn't doing the trick -- I need to reserve 200 meg or so of my outbound (upstream) bandwidth for VoIP to end complaints about voice quality. Any example of how to classify SIP, RTP, IAX, and Skype traffic and put a rate limit on anything that doesn't fall into that category? The VoIP phones also are in their own IP range on the LAN side if that would make things easier...or I could even connect them into a specific port on the internal switch in the router.
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