I don't know of any way to do this for multiple dial peers. One possibility would be to have all calls over the SIP trunk use a single dial peer. There are a couple of ways I can think of to do this:
1. Use an access code for calls going over the trunk, for example have users dial 8 + four digit extension, so dialing 81234 would hit this dial peer:
dial-peer voice 1 voip
destination-pattern 8....
session protocol sipv2
session target ipv4:1.1.1.1
max-conn 5
You could then use a voice translation rule to strip the 8 or strip it on the PBX side.
2. You could use num-exp to essentially to the same as the above except the user would not have to dial 8. So, if you're sending 1... and 2... across the SIP trunk, configure the following:
num-exp 1... 81...
num-exp 2... 82...
You can then use the dial peer and voice translation rule suggested above.
Hope this helps.
Brandon
