Saturday, November 27, 2010

Creating Voip Dial Peers

Well I figured I would make use of the extra T1 ports that I had on both my 1760 routers and create some voip dial-peers since I had the dial-peer pots working really well. While I have one T1 broken out as a simple CAS connection for making a PSTN type connection. I created the other one as a data T1 with IP addresses on each end to simulate a WAN network. Here's a small snippet of my 1760 that's acting as a remote router's running config:

This is configured to be a simple CAS T1
controller T1 0/0
 framing esf
 linecode b8zs
 ds0-group 1 timeslots 24 type e&m-wink-start


This is configured to be a WAN T1 connection
controller T1 0/1
 framing esf
 linecode b8zs
 channel-group 0 timeslots 1-24

This dial-peer is configured to send calls out of the CAS T1
dial-peer voice 1001 pots
 description outbound calls to x1001
 destination-pattern 915551001
 port 0/0:1
 forward-digits 4

This dial-peer is configured to send calls out of the WAN T1
dial-peer voice 8008 voip
 description outbound calls to x1001 using IP
 destination-pattern 915551001
 translate-outgoing called 1
 session target ipv4:69.1.1.1

Obviously I don't have both T1's up at the same time, I did this however to experiment with the different things that will happen depending on how the call is sent out of the gateway. This type of configuration will be useful for the CCNP:Voice I bet, I can have certain calls forward out through the WAN and others out of the PSTN. Or I can create some type of configuration in CUCM that'll allow for calls to be forwarded out of the PSTN if the WAN connection fails!

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