VOIP IP Phone Only Working Through ICS?

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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[code]...

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We've been configuring our swtichports as follows for our 7945 and 6941 type VoIP Phones, but are having problems witht the 6901.
 
VLANS
Vlan 900 is a VoIP VLAN
Vlan 999 is a NULL VLAN and is shut down:
 interface g0/1
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spanning-tree portfast
                 
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mls qos trust cos
spanning-tree portfast
 
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May 21, 2013

I have a Cisco SG 300-20 as the core switch, layer 3. It is 192.168.4.6 on VLAN1 and 192.168.5.1 for VLAN2 (VOIP). All the ports are set in trunk mode. DHCP relay is setup on this switch.
 
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DHCP for both VLANs is provided by a Windows Server 2008 R2 server (the relay IP 192.168.4.15).
 
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Cisco VPN :: 5540 - VoIP Over VPN

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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Mar 26, 2012

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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

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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

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Feb 5, 2012

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