The RG 8700 sends messages to the Lotus Sametime Unified Telephony at regular intervals. The RG 8700 relies on the response from the Lotus Sametime Unified Telephony to determine that the link with the Lotus Sametime Unified Telephony is good. In case the RG 8700 does not get a response to its register requests at pre-determined intervals, it assumes the WAN is down and switches to Survivability Mode.
Switching from normal to Survivability Mode is fully automatic and virtually transparent to the user. However, a special message is displayed on the optiPoint phones to advise the users that the RG 8700 is temporarily in Survivability Mode. Connected two-party calls in progress with other dual-registered optiPoint phones will be maintained; calls that were on hold or in the process of dialing or otherwise not in a stable connected state, will be dropped and must re-initiate the call. Also, calls that were established between a PSTN (Public Switched Telephone Network) user and a dual-registered RG 8700 user will be maintained.
When in the Survivability Mode, there is no communication between the RG 8700 and the Lotus Sametime Unified Telephony. SIP Registrations and Invites are received and handled by the RG8700. The “From” field of the INVITE contains the originating party DN (Directory Number). The RG 8700 digit translator translates the called number digits in the “To” field.
It is possible to have multiple RG 8700s in one location. While in Survivability Mode, it is possible for phones registered on one RG 8700 to call a phone registered on another RG 8700, however, the call must be routed via the PSTN.
Parent topic: Survivability Overview
RG 8700 SMG (Survivable Media Gateways)