CHAPTER28 Configuring Supplementary Services
Mediant 800 Gateway & E-SBC | User's Manual
If the MWI service is active, the MWI dial tone overrides this special Call Forward dial
tone.
Call Forward Reminder Dial Tone (Off-Hook) upon Spanish SIP
Alert-Info
The device plays a special dial tone to FXS phones in off-hook state that are activated with the call
forwarding service. The special dial tone is used as a result of the device receiving a SIP NOTIFY
message from a third-party softswitch providing the call forwarding service with the following SIP
Alert-Info header:
Alert-Info: <http://127.0.0.1/Tono-Espec-Invitacion>;lpi-aviso=Desvio-Inmediato
This special tone is a stutter dial tone (Tone Type = 15), as defined in the CPT file (see Call
Progress Tones File).
The FXS phone user, connected to the device, activates the call forwarding service by dialing a
special number (e.g., *21*xxxxx) and as a result, the device sends a regular SIP INVITE message
to the softswitch. The softswitch later notifies of the activation of the forwarding service by sending
an unsolicited NOTIFY message with the Alert-Info header, as mentioned above. When the call
forwarding service is de-activated, for example, by dialing #21# and sending an INVITE with this
number, the softswitch sends another SIP NOTIFY message with the following Alert-Info header:
Alert-Info: <http://127.0.0.1/ Tono-Normal-Invitacion>; Aviso = Desvió-Inmediato
From this point on, the device plays a normal dial tone to the FXS phone when it goes off-hook.
The feature is applicable only to FXS interfaces.
Remote Handling of BRI Call Forwarding
The device supports call forwarding (CF) services initiated by ISDN Basic BRI phones connected
to it. Upon receipt of an ISDN Facility message for call forward from the BRI phone, the device
sends a SIP INVITE to the softswitch with a user-defined code (see procedure below) in the SIP To
header, indicating the call forward reason.
The feature is applicable only to BRI interfaces.
call forward service can be one of the following:
■ “cfu-activate”: Call Forwarding Unconditional activated
■ “cfu-deactivate”: Call Forwarding Unconditional deactivated
■ “cfb-activate”: Call Forward on Busy activated
■ “cfb-deactivate”: Call Forward on Busy deactivated
■ “cfnr-activate”: Call Forward on No Reply activated
■ “cfnr-deactivate”: Call Forward on No Reply deactivated
For example:
INVITE sip:400@10.33.2.48;user=phone;facility=cfu-activate SIP/2.0
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