Ringback tone not sent to all sip clients

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Jul 15, 2021
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2021-07-31 14:19:06.234080 [DEBUG] switch_ivr_originate.c:1407 Play Ringback Tone [%(400,200,400,450);%(400,2000,400,450)
I have two internal extensions, one is running Zoiper Client and another is running Sipnetic.

When I call from Zoiper to Sipnetic - I don't hear a ring back tone at all - it is silent, however calls do get established and when the other party answers, audio works.

When I call from Sipnetic to Zoiper, I get the above line in the freeswitch logs where the server is sending a ringback tone, and I hear a ringtone but it is a US ring tone and not a UK ringtone. (this is a separate issue)

I tried using Linphone - when I use that again I hear no ring back tone on the client, the server doesn't send the

2021-07-31 14:19:06.234080 [DEBUG] switch_ivr_originate.c:1407 Play Ringback Tone [%(400,200,400,450);%(400,2000,400,450)


All the extensions reside on the LAN and there is NO NAT involved, Can you let me know what needs to be looked at to resolve this?

I looked at a similar issue here but there was no resolution
 
Jul 15, 2021
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Just to add to the issue: Ring back tone is heard on Zoiper client when an external call is made, i.e from Zoiper ->freeswitch -> external call

Zoiper->Freeswitch->internal - no ringback tone
 
Jul 15, 2021
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Just an update, this seems to be an issue when Opus module is enabled and Opus codec is set in preferred codecs. When I remove Opus and just have PCMA, the ring back tone is heard.
 
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