I'm quite new to sip/cucm/gateways and I'm trying to learn in a home lab environment. I'm currently running a VG202 (ios 15.1) with some basic config, and cucm 8.6.

My config is successful enough to allow inbound and outbound calls, with audio in both directions (thanks to some winning guides on UCPros) but I'm having an issue with inbound calls from the ITSP side.

When the inbound calls disconnects, the call remains active on the IP Phone for around 20 seconds before it clears, even though the calling party has already ended the call at their end. It doesn't do this on outbound calls - and I can't seem to identify the issue.

Is there anyone on the forum that could take a look at my config and check I haven't missed anything obvious? I've attached the config and sanitised it.

Equally, I'm not sure if it's something within the CUCM trunk that might be causing the issue - I'm quite new to this, and still learning.

Any advice or guidance would be greatly appreciated :)

Samuel