[cisco-voip] hairpin IP traffic to other router

[Richard Bennett]

Hi,
On an AS5400 ios 12.4(1)  I'm trying to forward some SIP traffic to another 
gateway.
For the forwarding I setup these dial peers:

dial-peer voice 1 pots
 description catch 2021 and reroute
 incoming called-number 2021
 direct-inward-dial
!
dial-peer voice 2 voip
 description send 2021 to router 2
 destination-pattern 2021
 session target ipv4:10.0.0.2
!

The idea being that incoming SIP traffic starting with 2021 would be sent on 
to an AS5400 on 10.0.0.2 .

When I look at 'debug voip dialpeer all' I see this:

   Calling Number=, Called Number=2021031234567, Peer Info 
Type=DIALPEER_INFO_SPEECH
06:45:08: //-1/2810714F8C70/DPM/dpMatchPeersCore:
   Match Rule=DP_MATCH_DEST; Called Number=2021031234567
06:45:08: //-1/2810714F8C70/DPM/dpMatchCore:
   Dial String=2021031234567, Expanded String=2021031234567, Calling Number=
   Timeout=TRUE, Is Incoming=FALSE, Peer Info Type=DIALPEER_INFO_SPEECH
06:45:08: //-1/2810714F8C70/DPM/MatchNextPeer:
   Result=Success(0); Outgoing Dial-peer=2 Is Matched
06:45:08: //-1/2810714F8C70/DPM/dpMatchPeersCore:
   Result=Success(0) after DP_MATCH_DEST
06:45:08: //-1/2810714F8C70/DPM/dpMatchPeersMoreArg:
   Result=SUCCESS(0)
   List of Matched Outgoing Dial-peer(s):
     1: Dial-peer Tag=2

So it looks as if the dialpeer is found correctly, yet nothing is sent to the 
other router.
Is this the correct way to forward SIP/h323 traffic to another router?
Is the   dial-peer voice 1 pots actually needed when using SIP in SIP out?
Any idea why the calls are not being forwarded?

Thanks a lot.
Richard.