Cisco VPN :: ASA 5505 Site-to-site VPN With Multiple Networks

I have a problem configuring a Cisco ASA 5505.Our company established a second facility, that should be connected using VPN to our headquarter.I used the ASDM "Site-to-site VPN wizard" to create a connection, which works fine with our main network.
 
Following structure:

Headquarter:
Cisco ASA 5505, firmware 9.1, ASDM version 7.1
Outside: fixed IP
Inside: IP of the interface is 192.168.0.1/24  (data network)

Now I have a second network 192.168.1.0/24  (VoIP network), PBX address is 192.168.1.10.Both networks should be accessible via VPN.
 
New Facility:
Cisco ASA 5505, firmware 9.1, ASDM version 7.1
Outside: fixed IP
Inside: IP of the interface is 192.168.2.1/24
 
I already created a connection, so that a PC from the new facility reaches the data network. E.g. a ping from 192.168.2.100 to 192.168.0.100 is possible.Now, I would like to add some VoIP telephones to the new facility, that can reach the PBX on 192.168.1.10.In the connection, I already added both networks as Remote  network:

object-group network Testgroup
network-object 192.168.0.0 255.255.255.0
network-object 192.168.1.0 255.255.255.0
access-list outside_cryptomap extended permit ip object-group Testgroup object Remote-Network
 
My problem is now, I don't know what to set as "Gateway" on my PBX.I can't use 192.168.0.1 because it is another subnet. Also I can't set a second IP 192.168.1.1 to the interface of the ASA., how I can realize this, so that both subnets are accessible via VPN and all the devices have a gateway set?