Cisco AS5300 Dial peers

[DaveGreeko]

I'm trying to exchange calls between 2 SIP proxies and and a cisco gateway (AS5300)
Let me first show you what what I'm trying to accomplish before I explain my problem

SIP_Proxy_1<--->AS5300<-->SIP_Proxy_2
------------------|------------------
------------------|------------------
---------------|-PSTN-|--------------

Calls are sent from proxy 1 to proxy 2 with prefix 2222
Calls are sent from proxy 2 to proxy 1 with prefix 1111
Proxy 1 and proxy 2 calls out to PSTN through the gateway with prefix 9999
proxy 1 and proxy 2 do NOT dial fixed length digits after the prefix, it always varies.

here are my dial peers settings:


dial-peer voice 1111 voip
destination-pattern 1111T
voice-class codec 10
session protocol sipv2
session target ipv4:192.168.1.1
dtmf-relay rtp-nte
no vad
!
dial-peer voice 2222 voip
destination-pattern 2222T
voice-class codec 10
session protocol sipv2
session target ipv4:192.168.1.2
dtmf-relay rtp-nte
no vad
!

dial-peer voice 100 pots
destination-pattern 9999T
no digit-strip
direct-inward-dial
port 0
!

I'm sure I have Dial-peers not configured right but I cannot figure it out.
when SIP proxy 1 calls exten 2222175 on proxy 2
the AS5300 returns (SIP/2.0 404 Not Found). Any guiding how I can accomplish this task is really appreciated, I'm no cisco guy but I'm under so much pressure
Dave,