CUBE and SIP question

[Bekzod Fakhriddinov]

Hi, we have one cube and sip to service provider(SP) , management is considering another redundant SIP trunk to be established via another l3mpls network we use for data traffic only . The thing is CUBE is not directly connected to that l3mpls network but connected via LAN . 

Is it possible to setup 2nd  SIP trunk to be established via another l3mpls network over LAN ? 

I don't know how to deal with IPs at this case, cause we are connecting to PUblic ip of the SP...

and also I don't have PVDM modules and CUBE license on the router connected to that l3mpls network...

Any idea, recommendations?  

Thank you 

[R0g22]

Any issues with calls ? That does not look like an error.

[Bekzod Fakhriddinov]

incoming call drops in 5-10 sec . ITSP is sending Session-Expires:  1800;refresher=uas . 

Ok fixed it too :D, they had transpost as udp, mine was tcp, I changed to udp and no drops  so far 5 minute active .  

[Bekzod Fakhriddinov]

Hi Nipun,  can u tell me how to correlate Call-ID in logs debug voip inout and debug ccsip messages, ? 

debug voip inout  logs has more information but call id is different if u compare with debug ccsip messages. 

 I often have this issue when troubleshoot sip, and would be great if there is way to correlate them. Thank you 

For example:

468763: Apr 12 16:17:30.231: //7636505/0C6D17000004/CCAPI/cc_api_call_disconnect_done:
Disposition=0, Interface=0x25B71684, Tag=0x0, Call Id=7636505,
Call Entry(Disconnect Cause=16, Voice Class Cause Code=0, Retry Count=0)
468764: Apr 12 16:17:30.231: //7636505/0C6D17000004/CCAPI/cc_api_call_disconnect_done:
Call Disconnect Event Sent
468765: Apr 12 16:17:30.231: //-1/xxxxxxxxxxxx/CCAPI/cc_free_feature_vsa:

468766: Apr 12 16:17:30.231: :cc_free_feature_vsa freeing 289F9D38
468767: Apr 12 16:17:30.231: //-1/xxxxxxxxxxxx/CCAPI/cc_free_feature_vsa:

468768: Apr 12 16:17:30.231: vsacount in free is 2
468769: Apr 12 16:17:30.841: //7633737/334841A78176/SIP/Msg/ccsipDisplayMsg:

Via: SIP/2.0/UDP x.x.x.x:5060;branch=z9hG4bK6A0CA8239A
From: <sip:2133149210@x.x.x.x>;tag=3B1DFF9C-2510
To: "14803836933" <sip:4803836933@x.x.x.x>;tag=gK084ee693
Date: Thu, 12 Apr 2018 16:17:30 GMT
Call-ID: 86520506_50305714@a.a.a.a
User-Agent: Cisco-SIPGateway/IOS-15.4.3.M8
Max-Forwards: 70
CSeq: 187 OPTIONS
Contact: <sip:2133149210@x.x.x.x:5060>
Content-Length: 0

[R0g22]

For SIP, it is written right there -

Call-ID: 86520506_50305714

For CCAPI, it would be - //7636505/

[Bekzod Fakhriddinov]

yes, I know that, and as u can see they are different. So my question was- it would be helpfull if possible to correlate them somehow, is it?.  For example if u have a lot of calls , ccapi show much more details , and if u can correlate both ccapi and ccsip messages would be easier . 

[R0g22]

They will be different since they are for two different processes all together and are handled by two different areas of the voice stack on the IOS. Unfortunately there is nothing available to co-relate other than understanding how the IOS processes calls and what parts of the VoIP stack does the call traverse through. Once you understand the stack, it's not that difficult to be honest.

[Bekzod Fakhriddinov]

HI Nipun, 

WHat is the best practice in case when users dial their own full 10/11 digit  DID from inside instead of 4/5 digits? Right now I have setup from vendor when if I dial our own  10/11 digit DIDs from my desk phone  that call go to CUBe and coming back to CUCM . I think there should be way to avoid this and route such calls on CUCM only, this would decrease load on the SIP and CUBE , simplify troubleshooting...
But I am not sure how to correctly do this, with translation patterns and where to apply them .  What  do you think?  

[Dennis Mink]

YOur ITSP, how do they currently connect to your cube?  through a public IP address?

You would need to talk to the ITSP and see how they can make inbound calls redundant. It all depends on thier service offerings.

some ITSP's load balance inbound call across a CUBE pair, or HA a CUBE pair.

[Bekzod Fakhriddinov]

Thank you Dennis, the existing SIP ITSP connected via public IP, the new one for new SIP connection over L3MPLS , I am planning to do is via private IPs . And this is a challenge for me too for this backup SIP I'd need to give sip provider my internal ip ?? which is not secure... 

sip---cube---lan---routerB---l3mpls--

Unless if there is possible to run routerB as just router and use existing CUBE as CUBE only. So routerB would  process voip flow as just ip flow .. 

what do u think ?