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The

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supports the SIP OPTIONS ping feature whereby a SIP OPTIONS request is periodically sent to a pre-configured or FQDN IP peer (IPv4 and IPv6 are supported) to check its status and discover any new capabilities. The OPTIONS request is sent via the Signaling Port of the zone configured for the peer. The From header of the OPTIONS request is populated with the IP address of the Signaling Port used.

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The Path Check Profile is a proactive system where, if the peer is associated with a profile, then OPTIONS request is sent to that peer continuously to monitor its state. If the peer responds, then it is considered as available. If the peer does not respond even after the configured number of retries, then that peer is blacklisted. Alternatively, if the blacklisted peer responds within the configured number of times, then it is considered as available and is removed from the blacklist. See Refer to Path Check Profile - CLI or Service Profiles - Path Check Profile (EMA) for configuration details.

The SIP ARS Profile, on the other hand, is a more reactive system. It is triggered when a Trunk Group includes a configured SIP ARS Profile when an INVITE request is sent to the associated peer and the INVITE times out. This also applies for cases where recoveryAlgorithm configuration is set to "probe" (not "timer"). The peer is immediately blacklisted and the job of the OPTIONS is to indicate its availability again. See Refer to SIP ARS Profile - CLI or Service Profiles - Sip Ars Profile (EMA) for configuration details.

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