3-way: Silence for 2nd caller when 3rd caller answers

[JamesSquire]

When making a 3-way call involving an external number, there is an issue with one of the parties losing audio when the external number answers.

This only happens when the 3-way call is established before the external number answers.

To clarify:

A+B are internal
C is external

1. A calls B
2. B answers
3. A puts B on hold and dials C
4. C is ringing
5. A establishes the 3-way call while C is ringing
6. A+B hear the ringing and each other
7. C answers.
8. B can no longer hear A+C, and they cant hear B but can hear each other
9. B holds and unholds the call
10. A+B+C can now hear each other

Please see attached logs.

The handsets involved are a Cisco SPA504G and Linksys SPA941, and the same has been replicated using Snom M3.

 

[leejor]

What version of 3CX are you running? Is this a new install? Did the problem just start or have you had this issue from the beginning?

 

[JamesSquire]

This is a relatively recent, new install (couple of weeks).

This is the first time we have encountered the problem.

Version: v9.0.13545.594 SP.1

Thanks.

 

[mhanson]

I would like to know what phones A and B are using

 

[JamesSquire]

A = Cisco SPA504G
B = Linksys SPA941

Also occurs with the following:

A = Cisco SPA504G
B = Snom M3