First thanks Sophos for the home use product!
After the upgrade to 9.210-20 on Monday the VoIP function intermittently stops rewiring the SIP Via and Contact headers breaking SIP signalling.
Setup is CUCME behind the UTM with media pined through a MTP so RTP and SIP signalling is presented from the same Internal IP Address regardless of the endpoint. SIP is registered to a ITSP through the SIP UA on the CUCME with register settings that have worked for a number of years before and after migration to the Sophos UTM product. SIP ALG is disabled.
Issue can be temporarily resolved by disabling and re-enabling VoIP then changing the Security Option and clicking Apply.
Using TCPDump via SSH to monitor the SIP signalling immediately breaks the header re-write function.
At this stage I am thinking of disabling the VoIP function for manual NAT / Firewall rules with header manipulation on the CUCME just to get it working again. Anyone else having this issue after the upgrade or maybe point me in the direction of a possible fix.
This thread was automatically locked due to age.