Calls cannot be answered in Zoiper

Question

Hello,
I use Zoiper for 4 lines. Everything works fine.
Today I added the next account. Incoming calls are hung up immediately with the error message "Can't find matching codec in SDP (Code: 2)". Outgoing I can dial numbers and they also ring. The codecs are the same as in the other accounts, which work perfectly. What can be the reason for this?

Comments

It is possible that your server is sending encrypted RTP (SRTP), while this option is not enabled in Zoiper. The issue here is that you PBX probably accepts both SRTP and standard RTP, which leads to your outgoing calls being accepted. But when the server sends you the call, it is forcing SRTP.

Make sure that your transport is set to TLS and the SRTP (SDES) is enabled in Zoiper.