06-12-2017 11:05 PM - edited 07-05-2021 07:11 AM
Given below is issue we are facing:
Phone A: Wireless G model
Phone B: Desktop 7975G model (CIPC)
When phone B calls Phone A, audio is not being transmitted to Phone A. Phone B is able to hear everything phone A says clearly.
But Phone A is not hearing anything (not even static). The only way to solve it is to disconnect the call again and again.
The issue occurs randomly and is not effected by whether the connection is showing full strength or less.The wireless phones have full coverage in most of the places in our office.
Could someone please guide us on how to go ahead and troubleshoot this issue.
Regards
06-13-2017 12:33 AM
Can the 7925G make a successful call to an outside line?
06-13-2017 01:42 AM
Hi Leo,
Thanks for the reply. We are able to make the calls to the external or internal lines. The issue occurs randomly between the 7925G Wireless phones and CIPCs resulting in one way audio. But many users have raised the same concern over the past few days. Would be glad if you are able to help on this.
06-13-2017 02:59 AM
The issue occurs randomly between the 7925G Wireless phones and CIPCs resulting in one way audio.
One-way audio always points to NAT mis-configuration.
06-19-2017 07:44 AM
Are you running 8.3.121? I noticed a very similar issue on a voice grade network in our test environment almost immediately going from 8.3.112 to 8.3.121.
06-19-2017 09:37 PM
It could be CSCve20123. It is listed in TAC recommended code releases notes section under AireOS 8.3
Customers that use TSPEC (typically VoWLAN clients such as 792x, 882x, Spectralink), and deployments that use AVC traffic marking, should avoid 8.3.121.0 due to CSCve20123. If such customers want to use 8.3, TAC can provide an 8.3MR2esc build with the fix.
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06-21-2017 02:15 PM
Thanks! I'll contact TAC as I'm pretty sure I'm hitting this bug.
07-18-2017 05:36 PM
DO NOT, under any circumstances, load 8.3.121.4 (Escalation Image). There is a strong chance this version will degrade your voice SSID.
There are some discussions about this development HERE.
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