AudioCodes Mediant 800B User Manual page 939

User's Manual
Parameter
use-facility-in-req
[UseFacilityInRequest]
Version 6.8
Enables the device to indicate the type of call forwarding service in
the Request-URI of the outgoing SIP INVITE message, using a
proprietary header parameter "facility=<call forward service>".

[0] = (Default) Disable

[1] = Enable
939
57. Configuration Parameters Reference
Description
Mediant 800B Gateway and E-SBC