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This Best Practice describes how the

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 (SBC)  handles incoming calls when the Server server is down or unreachable. The SBC routes the calls according to general configuration guidelines. The information below includes expected behavior for call routing when there is a problem reaching the server (i.e, registration fails, wrong configuration, etc.).

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This Best Practice assumes the following: Incoming call is based on Federated IP/Signaling Group listen port/transport protocol. Incoming call is one of the following: ISDN, SIP, or CAS.

Call Survivability when SIP Server is down - How calls are routed with PSTN Backup (SIP Survivability)

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A call route to the PSTN must be created in order for calls to be re-routed to the PSTN as a backup mechanism if the SIP Server is unavailable. See Managing SIP Server Tables and Managing Call Routing Tables.

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• Incoming call is allowed. Since the server is down, the Signaling Group's Server Status is set as Down. Instead of attempting to send calls to the server, the call proceeds to the next Destination Signaling Group (if configured based on the routing policy, which must include the PSTN). See Managing Signaling Groups.
• Based on routing configuration, incoming calls are made without any post dial delay to the configured SIP or ISDN trunk.

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Basic Call Mode with Agent Type as "Back-to-Back User Agent" Configuration - How Incoming Calls

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Are Handled

Below are the components of a basic configuration

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• The corresponding session is up.
• Invite requests are routed to the corresponding Signaling Group (the status is set to Up).

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Forward Register after Local Processing Mode - How Incoming Calls

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Are Handled in the SBC

Below are the components of a configuration that includes Forward Register after Local Processing Mode (configured through the SIP Signaling Group).

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• Normal call flow for incoming call. In case the Server is down, there may be post dial delay in attempting to call the Server.

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Troubleshoot Configuration for

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Connection to a Server

To troubleshoot a server failure due to configuration, verify the current Registration and SIP Server Options configured on the SBC.

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