Hi all,I use Linphone with a Fritzbox 6591 Cable. Registration on the Fritzbox works perfectly; incoming calls are forwarded to Linphone, and it is possible to call external numbers from Linphone - that is, the connection is established and when a person answers a call made from Linphone, voice is transmitted.
However, if an automated system (e.g., “press 1 for ...,” “press 2 for ...”) answers the call, an automated message plays, or the call is transferred on the receiving side, no voice is transmitted.
I have changed the following options without any change in behaviour: * Transport (UDP/TCP) * DTMF send method (SIP info/RFC2833) * Allow IPv6 (on/off) * Enable ICE (off/on/on with stun.linphone.org set to 127.0.0.1)(Most tests were conducted using Linphone Desktop 5.3.1 (Linux), but the issue also occurred in Linphone 6.)
In a test with Zoiper5 and the same account on the Fritzbox, this problem does not occur.
I would appreciate any advice on what I might be overlooking or doing incorrectly.
Thanks in advance Thomas
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