Static line after the call is placed on-hold

[Incred]

I received a report that when a mobile number calls the destination (DID) called then is placed on hold, and when the receiver talks to the caller, the line becomes very static.

Please note that this only happens when 1) the caller uses a mobile number to call and 2) the phone is placed on hold then the receiver goes back to the caller again

There's no issue on the line so long as the call isn't placed on Hold.

Does anyone know what's going on and if anyone has experienced this?

 

[Incred]

Further to the post above, this issue only occurs when the calls is using a mobile phone.

In another post about the same issue it was suggested to only allow ULAW & ALAW and disable media_mix_inbound_outbound_codecs

Weird audio after putting call on hold

Hi, We have an issue for multiple domains where a call is taken fine, then put on hold, and after it is taken off hold or transferred the callers voice goes very weird and sounds almost like a dalek, but is inaudible. This doesn't however happen with every call. I'm not really sure where to...

www.pbxforums.com

Any thoughts on this?

My current CODECS are shown below: