Forum Discussion
PSTN Call Drops if you put the call on hold then resume and hit transfer
Hi jxace
Our root cause was someone had defined an extra sip port on the hosted SBC trunk in our Direct routing setup
The hosted SBCs were load balancing between 2. Unfortunately though, the fqdn in the contact header means this caused problems with TEAMS.
Our SBC provider disabled the 'bad' port - then all calls were fine in the respect of any ACKs or re-invites etc between TEAMS and the SBC.Not sure if this helps but good luck
We are experiencing this issue with our auto attendant with the Conference mode switch on, we have tired removing the custom music on hold, the Auto attendant then started to transfer calls through to our call queues and then stopped again, we get the lovely message "sorry we cannot connect your call at the moment" and then it drops the call.
Our SBC provider has reviewed the logs on the failed Auto Attendant transfers and Microsoft are not sending back the SIP invite after it transfers, I assume because they are just dropping the call.
No changes have been made on our Auto attendants or call queues so it must be an upgrade gone wrong 😞
Shane Toal I'm dealing with a much simpler setup with an on prem Cisco CUBE SBC. Have had 4 TAC engineers look over the config, NAT through the firewall is proven correct. I've got a case open with Microsoft now to find out why when they send packets back dealing with REFERs from an Auto Attendant then to a Call Queue they are missing the "user" information. MS support is a joke, btw. Zero communication and we've been dead in the water this entire time.
Hi jxace
Our root cause was someone had defined an extra sip port on the hosted SBC trunk in our Direct routing setup
The hosted SBCs were load balancing between 2. Unfortunately though, the fqdn in the contact header means this caused problems with TEAMS.
Our SBC provider disabled the 'bad' port - then all calls were fine in the respect of any ACKs or re-invites etc between TEAMS and the SBC.Not sure if this helps but good luck