Hello,
I have the following setup:
CISCO gateway -> FS-> SIP endpoint
Some of the calls are perfectly connected with long average call duration but some them are disconnected with NORMAL_TEMPORARY_FAILURE with very low ACD.
I don't know if is a FS problem or SIP endpoint issue.
In FS is enable param inbound_late_negotiation and in dial_plan bridge_early_media=true is true. The codec negotiation should be made between CIsco and SIP endpoint