Cisco Router 2911 not transmitting SIP messages.

[DJ]

Hi Guys,

I see a buggy behavior, where i can see router is generating SIP message on debug but not transmitting it on interface level.

IOS version Version 15.2(4)M4

Hardware 2911/k9

Ran some debug and wireshark to confirm this.

debug voip ccapinout

debug ccsip messages

Call Flow: CUCM -> VGW -> FXS port

Debug shows call hitting from CUCM to VGW.

VGW sending 100 Trying and session in progress.

But CUCM does not receive this.

So i captured wire shark from CUCM facing interface and can see that router is not sending any SIP packets, just the transmission from CUCM side.

We have tried rebooting router.

There is SIP source and Media binding. 

Still in enabled mode.

 Any Advice will be helpful.

Regrads

[R0g22]

Take a pcap from the router interface and share here please. Also, is there a firewall or riverbed b/w the CUCM and GW ?

[DJ · Accepted solution]

we found the issue.

it was due to error on routing table.