Hi, I know this is an endpoint/network issue but want to confirm this behaviour is RFC friendly (infrastructure provider questioning it) Call from ATA (NEC Fibre ONT) to FS to PSTN. ATA calls a PSTN number and is put on hold from PaBX on that end. ATA either stops sending media or the BYE is lost (either can be assumed). Because B leg is on hold media is received and FS continues sending to A leg but receives no RTP back. 30 mins or so pass and FS attempts to end A leg. During this time ATA makes another call, sends invite using same port as before, wireshark ends up showing 2 streams going back to ATA, one from new call and one from "lost" other call. Issue this causes is NEC ONT attempts to play the 2 streams of incoming G711a creating interesting audio. Assuming because b leg is still active it is waiting for the 1800 sec session timer to expire? And if the call was to a person and not on hold music they would realise call isn't working and hang up, causing the B leg to end and FS to close A leg anyway? Thanks Nathan