No Response to SIP request

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link
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No Response to SIP request

Post by link » 01 Feb 2018 16:40

Hello,
In our environment are OXE 11.0 and Myteamwok system.
A problem recently appeared (cause: (20018) No Response to SIP request') in MyTeamWork cdr stat. The problem is that the caller receives a call, but after picking up the phone, the silence
All devices are IPtouch like 4008/4018/4028.

Can you suggest me how to fix if?
Thanks.

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cavagnaro
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Re: No Response to SIP request

Post by cavagnaro » 01 Feb 2018 19:53

Seems a network issue where the RTP leg is not reaching the other side. Check with your network guys if they have changed anything on UDP rules.
Capture a Wireshark trace so you can follow it correctly, this capture must be done at all parties.

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link
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Re: No Response to SIP request

Post by link » 02 Feb 2018 05:17

Why RTP?
Maybe it's a problem with signaling (Problem with the message ACK towards the Myteamwok system)?

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Re: No Response to SIP request

Post by cavagnaro » 02 Feb 2018 05:38

He does receive the call...so signalling is ok, why would the ACK message go to another route, Port or anything? Signalling is using 5060 UDP or TCP.
The moment when you answer the RTP triggers.
So...as many years of experience ring my RTP bell, also because just solved yesterday a quite identical problem...root? Firewall guy blocked UDP ports from endpoints (iptouchs) toward the Sip Server.
I could be wrong? Of course. But as you provide no evidence, no logs, nothing and just ask for the best possible guess...then there you have mine based on my experience.

Cheers


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link
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Re: No Response to SIP request

Post by link » 02 Feb 2018 11:29

I agree with your opinion and I am also so far skolneni to the idea that the problem is in the network.
Also I'll make traces and log for analysis.

link
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Location: Ukraine

Re: No Response to SIP request

Post by link » 07 Feb 2018 15:42

I have checked incvisu and sipalarm and found the cause at the time of the problem.
5816=Minor failure in SIP component and TERMINATED_STATE failed to emit a Ack event.
Tomorrow i'll make traced and analyze.

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