Echo while transfer... how to fix?

Asterisk Asterisk Support
1

Hi,

connection looks like:

PSTN A—> Asterisk —> SoftPhone - there is no echo

Softphone user doing transfer call and it looks now:

PSTN A —> Asterisk —> PSTN B - there is ECHO!!!

But it looks weird. User on PSTN A dont have it, but another one on PSTN B have echo with himself.

Any idea why it happen and how to fix it?

Greetings

2

Try setting:
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
echotraining=400

in zapata.conf