IPO / SfB - SBC - Bell SIPT

[mguilmet]

Hi,


I have just put a SBC between mu IPO and my Skype for Business server. Everything seems to be configured properly on the SfB and SBC side. I can make calls from IPO phones to SfB users. However, I cannot make calls from SfB to IPO. The calls leave SfB server, are going thru the SBC and I can see them hitting the IPO but nothing happens after that. It looks like the IPO doesnt know which phone to ring.



Here's a call trace from SfB to IPO


955288045mS SIP Call Rx: phone
INVITE sip:3860@10.XXX.XXX.252;user=phone SIP/2.0
Via: SIP/2.0/TCP 10.XXX.XXX.253:5060;alias;branch=z9hG4bKac72517411 6
Max-Forwards: 69
From: "XXXXXXX" <sip:+53999;ext=53999@XXXXX.local;user=phone>;tag= 1c1405126161;epid=902F1D7780
To: <sip:3860@10.XXX.XXX.252;user=phone>
Call-ID: 3952056142192018104148@10.XXX.XXX.253
CSeq: 1 INVITE
Contact: <sip:10.XXX.XXX.253:5060;transport=tcp;ms-opaque=7b537d9addec44ee>
Supported: 100rel,sdp-anat
Allow: ACK,CANCEL,BYE,INVITE,PRACK,UPDATE
User-Agent: M800B/v.7.20A.202.112
Content-Type: application/sdp
Content-Length: 356

v=0
o=- 893849865 1097867657 IN IP4 10.XXX.XXX.253
s=session
c=IN IP4 10.XXX.XXX.253
b=CT:1000
t=0 0
m=audio 7190 RTP/AVP 97 0 8 101 13
c=IN IP4 10.XXX.XXX.253
a=rtcp:7191
a=label:Audio
a=sendrecv
a=rtpmap:97 RED/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:13 CN/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=ptime:20



Extension 3860 is configured with SIP Name 3860 - SIP Display Name User A and Contact 3860.


I have Incoming Call Route for SIP Trunk as Any Voice to Destination .



I'm not sure where to look anymore.



Thanks

 

[pkdev]

what version of IPO are you running ?
what is the answer from IPO to the INVITE message ?
what URI configuration do you have made on the SIP line ?

I have this working between an IPO and a SfB without SBC on a 10.1

 

[janni78]

There is no need for a SBC for it to work.
I would also expect S4B to send the all numbers in international format as that is the recommended way to do it.

"Trying is the first step to failure..." - Homer

 

[mguilmet]

Hi,

IPO is 10.1.0.1.0 build 3

There are no answer from the IPO to the SfB INVITE

I have 2 URI
one set to use Internal Data and the other Auto

I know there are no need for an SBC but it's the way CORP wants us to do it and Bell Canada is also strongly suggesting it if not forcing it now.

 

[janni78]

If it doesn't answer then it doesn't think any trunk should handle the call.
Then it's most likely your SIP trunk settings.

"Trying is the first step to failure..." - Homer

 

[mguilmet]

got it working. I was looking at INVITE messages and saw that the communication was using TCP. I realigned everything on the SBC and IPO to TCP and calls are now working...