03-15-2016 09:35 AM - edited 03-15-2019 06:16 AM
Hello,
I am running CUCM 11 and UCCX 11 with a SIP trunk for PSTN connectivity. I have several UCCX queues that work great internally but as soon as I make a call inbound from the SIP trunk I get audio clipping after a Call Unhold event.
Here is the basic UCCX script:
- call in queue
- call hold
- delay 30 seconds
- call unhold
- Play prompt ( the first 2 seconds of the prompt is clipped off and is just silence)
Here is the call flow:
ITSP>--SIP-->CUBE>--SIP-->CUCM>--JTAPI-->UCCX
Here is part of my cube config:
voice service voip
ip address trusted list
ipv4 10.150.21.5
ipv4 10.150.20.5
ipv4 71.161.127.11
ipv4 71.161.127.26
address-hiding
mode border-element
allow-connections h323 to h323
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
supplementary-service h450.12
fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none
h323
sip
rel1xx disable
midcall-signaling passthru media-change (I've tried this with media-change and without)
early-offer forced
Any ideas?
03-15-2016 10:22 AM
I have seen these clipping issues when we call outbound to a PSTN and SIP trunk is not set to send PRACK for 1XX messages.
So you need to make sure SIP trunk is set to send PRACK for all 1XX messages received from service provider.
In the SIP trunk early offer support for voice and video calls should be enabled as well.
03-15-2016 11:33 AM
Thanks for the info. I tried to enable PRACK for 1XX messages but it didn't seem to make a difference.
07-11-2016 06:03 AM
Hello there, I am facing the same issue with the same scenario. May I ask if you were ever able to find the source of the issue?
07-11-2016 06:13 AM
I opened a TAC case but the engineer was not able to fix the issue and I needed to get the issue resolved. Unfortunately I just added a couple seconds of padding to each message played in UCCX and all worked fine.
I wish I had found the root problem for the issue instead of putting a work around in place, but I needed to get the call center up and running.
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