Why doesn't call forwarding to the Cisco SPA 502g work as it should?

Question

Telephony

On the Cisco SPA 502g, the employee sets up forwarding in two ways:
* using the CFwdAll button * using the
code *72

In both cases, the behavior is the same:
* If the call is direct, then it transfers without problems to another internal and mobile phone.
* If the call goes to ivr, then goes to the phone with forwarding, and forwarding to mobile then there is no voice. And if forwarding to another internal number, then everything is in order.

In the logs, the codec is used when calling without a voice - G.711 a-law. With nat, according to the logs, everything seems to be correct, from our external ip the call goes to the external ip of the telephony provider.

Still I will add that automatic telephone exchange is asterisk.

Maybe someone has already experienced this?

Answer 1

Judging by this combination (code * 72), you are probably using asterisk + freepbx. And since you have one-way hearing, most likely your PBX is behind NAT (have you configured it correctly to work with NAT).
CFwdAll - sets forwarding directly on the phone, respectively, the incoming call reaches the phone and the phone makes a call to the mobile and connects the channel on itself, this type of forwarding will not work if the phone is turned off.
code *72 - sets forwarding directly on the telephony server and the call does not reach the phone.
You need to look at the dump. Collect a call dump using sgrep.