[SOLVED] Troubleshooting errors in call transfers via trunk to remote Asterisk

[Gef Buneri]

Ok, so in the end it seems that it's all about access policies on the SBC. Someone "forgot" that all trunks passing through this Sip server are forced to pass the RTP content through the SBC that isn't allowed to send/receive to and from the endpoint IP.

So basically the points to fix where 2:

1. 404 error on the remote side: "NOT FOUND" - resolved by configuring peers as type=peer on the Asterisk side and context=default, as reported in the Integration Reference Manual for Sip Server.
2. ACP rules on the SBC side that still need to be fully fixed to allow RTP content to go back and forth from the remote Asterisk IP.

Thank you all for the advice you have given me.