Audio Blank during PSTN Bridge call

Question

Hi All,
Our users are joining a PSTN Bridge call which requires them to be logged in continuosly for 5-6 hours. At times the call goes blank and users have to relogin the bridge again. Given below is the call flow where the User from Cluster 1 dials the number which in turn goes to Cluster 2 where the PSTN Bridge is present
Cluster 1
IP Phone --> PSTN Bridge Number -->CUCM--> MGCP Gateway --> Service Provider
Cluster 2
Service Provider --> MGCP Gateway --> CUCM --> Avaya Aura Conferencing Bridge
I have checked the following,
1) The MGCP PRI in cluster 1 and 2 have not fluctuated
2) The phone has not lost connectivity with CUCM
Any thoughts on what else needs to be checked to isolate this issue.

Answer 1

Are you working with Office365 and an ACP (Audio Conferencing Provider)?  If so, you could call in with a PSTN phone using the phone number the ACP provided.  If you use a Lync approved phone, you could potentially connect as well, but not
by dialing the number of the meeting, or any other number as this would be considered enterprise voice.  You would typically connect by using your Lync client and the better together experience to join the meeting.  In this scenario, a USB device
might be better and cheaper than an IP phone.
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SWC Unified Communications
This forum post is based upon my personal experience and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.