Audio issue on call ip phone inbound and outbound

[JonnyMalanday]

Hello everyone I'm having a issue on IP phone. Call was stablish but both side cant hear each other. I already change the port of the phone, but issue still persist. Ip phone model was 7821 and 8811. This case was isolated from only 2 phone, others was running smoothly. Is there any config I can do to validate that the IP address of those phones was not block voices packets?

[Maren Mahoney · Accepted solution]

One easy way to start examining the problem: While a call is in progress, you can look on the phone Settings Menu (Settings > Admin Settings > Status > Network Statistics) to see packets transmitted and received.

• If traffic is passing between the phones but neither end is hearing audio, then one or both of the phones has a likely mechanical problem.
• If traffic is passing in one direction but not the other, the phone that is not generating (or hearing) packets may have a mechanical issue.
• If traffic is not passing between the phones in either direction, then you can deduce that there is something blocking the traffic. 

You can also use Wireshark to capture traffic flowing to/from one of the phones to examine the signaling and payload packets.

Maren

[Nithin Eluvathingal]

As @Maren Mahoney  mentioned, from the phone status messages> call status you can see TX and RX packets. Check if the phones are sending and receiving packets. If phones are sending packets and you don't receive packets, then this is an routing issues.

Routing/Network issues are the main cause for No Audio.

[Carlo Poggiarelli]

Hi,

As first check you can use CUCM admin page and note the ip addresses of both phones and verify if they are in the subnet you expect they should be.

From the L3 core Switch/Router do a ping to each phone using source address option to make sure that connectivity exists between those subnets.

Please let us know 

Regards

Carlo