Hello, I have Asterisk 18.26.0, FreePBX, chan-sccp, and sccp_manager. I use CISCO 7942 ip phones. Problem: When I dial from one phone, the other one starts ringing, but when I want to answer the call, the call drops and in asterisk cli I get [2025-03-06 13:01:07] WARNING[12388][C-00000013]: res_rtp_asterisk.c:5593 ast_rtp_write: Don’t know how to send format alaw packets with RTP. I also tried the ulaw codec, I got the same warning. Can anyone help me what is wrong? I am a beginner
There is a recently filed open issue on the Asterisk side[1]. If a fix is required in Asterisk, it will not be resolved in 18 though.