Inbound calls with NO voice (two way voice issue)

[mnour401917_2]

Hi All,

We are having this strange issue where randomly 2 calls out of 10 will have no voice , the call connects but the caller and called number don’t hear anything. If the called number then Holds/Un-Hold then there is voice . Basically when the RTP stream is rebuild we get the voice stream.

Call flow is as following.

ITSP--->(SIP)--->CUBE--->(SIP) --->CUCM--->UCCX--->CUCM--->CUAC--->CUCM--->IPHONE

CUCM version is 10.5.X

UCCX version is 10.5.X

CUAC version is 10.5.X

Anyone seen this issue before?

Thanks for your help.

Nour

[Manish Gogna]

You need to enabled detailed callmanager service traces to compare the signaling in the good and bad calls. Check the SDP part of the INVITE and 200 OK / ACK messages to see which ports, codecs etc are exchanged. If this is okay then it is most likely a network issue , you may check any firewall in the call flow to see if there are any packet drops when the issue is experienced.

Manish

[Deepak Rawat]

What happens if you remove PSTN out of the call flow and just test it with below. This will give a clear indication if the issue is happening with internal calls as well or is it only the external calls causing the issue

CUCM--->UCCX--->CUCM--->CUAC--->CUCM--->IPHONE

Regards

Deepak

[mnour401917_2]

Deepak,

This might be a good test. I will test once i get a chance. Thanks.

Nour