Sophos XG SIP/H.323 Voip Call issues

If your PBX is on site and your having issues with the SIP Trunk, I would recommend disabling SIP ALG on the Sophos unit

More details

But if your PBX is hosting on the "cloud" and your having odd issues like calls dropping out and park bays disconnecting, I would recommend the following changes

You will need to putty in to the unit and connect to the device console for all the following

1. For good measure disable SIP ALG
2. type "system system_modules h323 unload" (Only need if its not SIP but H323)
3. type "set advanced-firewall udp-timeout-stream 150"
4. type "set ips sip_preproc disable" (Only needed if IPS is enabled or Site-to-Site VPN)
5. type "set vpn conn-remove-tunnel-up disable" (Only needed if IP Sec VPN are used)

I would test each step to see if one fixes it instead of just blasting it all at once and see what happens.

Sophos XG Firewall: VoIP calls may drop or encounter poor quality

Sophos XG Firewall: Audio and video calls are dropping or only work one way when H.323 helper module is loaded.

Sophos XG Firewall: Session Initiation Protocol (SIP) Support