SIP TO SIP

[richard.gosling]

Hi All,

I have a Cisco VG320 connected into a Cisco 2951 using CME this connects via Sip to a 4351 and another sip connection to another 4351 , sip works to the first Router but not the second?

Do I need  CUBE running for sip to sip?

Dial peers match can't understand why it's not working?

Ang help much appreciated!

[Adarsh Chauhan]

Can you please verify the call flow.

on which router does the call fail?

Cisco VG320 ---- Cisco 2951 ----- Sip----4351 ----sip---- 4351

You can take debugs on the router.

debug voice ccapi inout

debug ccsip messages.

Please attach the debug file.

[richard.gosling]

It gets to the first 4351 the second sip leg fails no ccsip messages and debugging ccsip messages doesn't show the next leg at all, so I'm thinking dial-peer or sip source.

Using the same dial peer for incoming and outgoing calls.

I can't post debugs unless I santise them.

[Adarsh Chauhan]

okay yea then please make sure that you have following commands in place.

allow-connections sip to sip.

Also make sure that the IP address trusted list on both router has each other's ip if not mentioned in dial-peers.

if you can give hints with the error code or messages then may be we can help.

[richard.gosling]

We get error 503 network unavailable, I set this up H323 all works fine, I also added ip2ip on sip and dial peers, did a call the other way and no sip messages on the 4351 at all so we have UC license and Cube.

[Mohammed al Baqari]

Can you share debug ccsip on the cube?

[richard.gosling]

Sorry I can't as a secure Network, not allowed or web ex.

[Mohammed al Baqari]

Ok . After which message you are getting 503

[richard.gosling]

It looks like a vrf problem as in the global table sip works, I thought it was vrf aware. We have specified a voice vrf.

So how do we force sip to use the voice vrf?

[R0g22]

Do you have multi-VRF ? AFAIK, ISR-4k do not support multi-vrf. Also, single VRF and multi-VRF cannot coexist. You need to only use multi-vrf.
Can you share a snippet of your dial-peers removing the IP addresses and an output for "show ip vrf" ?

[richard.gosling]

Ok I have removed the voice vrf and I get the Router to send an invite to the next hope but get error 408 and disconnect 102 all Routers are listening on 5060

[richard.gosling]

Just put every thing in the GRT all works, running just instance of vrf lite for MGMT.

I thought a brand new 4351 would be vrf aware????

[R0g22]

VRF and Voice is a bit finicky with loads of restrictions. As long as you have a single VRF which is also your Global Voice VRF (if you don't have a voice VRF added, default routing table is used), everything should be fine. Start there. If you have a lab, better. If you want to go the multi-VRF route, keep in mind the following important pointers -

1. Multi-VRF is not supported on SIP-TDM call flows.
2. Multi-VRF and Single/Voice VRF cannot co-exist. If you have to use multi-VRF, you need to remove voice VRF.
3. VRF route leaks are not required to bridge inter-VRF calls.
4. Most important, reload the router after making any VRF interface changes.

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/voi-cube-multi-vrf.html#id_14582

I was incorrect in saying that multi-VRF is not supported in ISR-4k. That restriction applies to CME only.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/manual/cmeadm/cmevrf.html

[richard.gosling · Accepted solution]

Yet again another Cisco IOS bug problem, 2 brand new devices with bugs ASA5508 as well. 

Do Cisco even test these Now!