Phone call will not terminate when remote party hangs up first

Hello forum,

I have a Cisco router with CME as a sub-pbx and I am using GV trunks with pbxes.org. The phones that are registered to the CME are SCCP. Calls can be placed and are received just fine, however, when the remote side hangs up first, the phone on the CME does not terminate. I have done "debug ccsip messages" on the router and I do not see a hangup message.\

I am new to pbxes and the voip game in general, so I am not sure what information I am supposed to post or gather.

If someone has information on this it would be greatly appreciated.

Thanks,

AJ Schroeder