AudioCodes Mediant 800B User Manual page 594

(e.g., softswitch) forwards an incoming call to another destination. The ring is emitted only
when the endpoint is in on-hook state.
The feature is useful in that it notifies the endpoint user that a call forwarding service is
currently being performed. The device generates a call forward reminder ring burst to the
endpoint upon receipt of a SIP NOTIFY message containing a "reminder ring" xml body.
The NOTIFY message is sent by the Application server to the device each time the server
forwards an incoming call. The service is cancelled when the device sends an
UNSUBSCRIBE request or when the subscription time expires.
Figure 27-4: Call Forward Reminder with Application Server
The following procedure describes how to configure the feature.

To configure the call forward reminder ring feature:
1. Open the Supplementary Services Settings page (Setup menu > Signaling & Media
tab > Gateway folder > DTMF & Supplementary >
Settings).
Figure 27-5: Configuring Call Forward Reminder Ring
2. In the 'Enable NRT Subscription' field (EnableNRTSubscription), select Enable to
enable endpoint subscription to ring reminder event notification.
3. In the 'AS Subscribe IPGroupID' field (ASSubscribeIPGroupID), enter the IP Group ID
of the Application server providing the services.
4. In the 'NRT Subscribe Retry Time' field (NRTSubscribeRetryTime), enter the retry
period (in seconds) for dialog subscription to the Application server if a previous
request fails.
5. Configure the reminder ring tone:
a. Configure a tone for the reminder ring in the Call Progress Tone (CPT) file (see
'Call Progress Tones File' on page 834).
b. In the 'Call Froward Ring Tone ID' field (CallForwardRingToneID), enter the ID
number of the tone that you defined in the previous step.
6. Click Apply.
User's Manual
Mediant 800B Gateway & E-SBC
594
Supplementary Services
Document #: LTRT-10632