Bit of an awkward one this....but maybe someone has seen simolar.
Mitel 3300 CX connected to SIP trunks via a firewall (which i don't control) to Hipcom trunks. Everything seems to be fine except hat when you do a consultation hold (transfer) if you leave it for longer than about 10 secs (whilst talking or letting it ring)the SIP trunk disconnects and you get "there is a fault" announcement from the line.
If the transfer is dealt with withing that time then everything is OK, you can retrieve the call if need be or complete the transfer and its OK, its just like there is a timer forcing the call out except for I would expect a NU tone or reorder tone from the network ratehr that he fault report being given out ?
Anyone any ideas? Trunk provider are blaming the firewall.....