This document covers the overview of SIP OPTIONS Ping feature overview and the steps for enabling the features.
SIP OPTIONS Ping
The SIP OPTIONS Ping feature can be enabled on the SIP Profile associated with a SIP trunk to dynamically track the state of the trunk's destination(s). When this feature is enabled, each node running the trunk's SIP daemon will periodically send an OPTIONS Request to each of the trunk's destination IP addresses to determine its reachability and will send calls only to reachable nodes.
A destination address is considered to be "out of service" if it fails to respond to an OPTIONS Request, if it sends a Service Unavailable (503) response or Request Timeout (408) response, or if a TCP connection cannot be established.
The overall trunk state is considered to be "in service" when at least one node receives a response (other than a 408 or 503) from a least one destination address. SIP trunk nodes can send OPTIONS Requests to the trunk's configured destination IP addresses or to the resolved IP addresses of the trunk's DNS SRV entry.
With OPTIONS Ping feature UCM periodically sends SIP OPTIONS to every remote destination peer, to detect its availability.
If the remote destination peer is unavailable (no response or it responds “408 Request Timeout” or “503 Service Unavailable”), UCM will mark this peer as unavailable.
If the remote destination peer is available (any other responses rather than “503” or “408”), UCM will mark this peer as available.
UCM will send new INVITE only to the “available” remote destination peers.
Only SIP trunk with default type, “type None(default)”, supports this feature
This feature is introducted from CUCM 8.5 onwards..
SIP OPTIONS Ping feature has been introduced to allow quick fail over and status report
OPTIONS message is sent to the remote destination peer periodically
Response from the remote destination peer decides if new INVITE is sent to it
In SIP Profile, SIP OPTIONS Ping section has the configurations to control this feature
Enabling SIP OPTIONS Ping is recommended for all SIP trunks because it allows Unified CM to track trunk state dynamically rather than determining trunk destination state on a per-node, per-call, and time-out basis.
OPTIONS Ping Feature Configuration
Here are the steps to enable OPTIONS Ping feature.
Create a SIP Profile with OPTIONS Ping enabled.
Create a SIP Trunk Security Profile (OPTIONAL, if you want to change the listening port or transport type).
Create a SIP Trunk to the remote destination peer and apply the SIP Profile and SIP Trunk Security Profile created above to the Trunk.
Go to Device -> Device Settings -> SIP Profile and create a SIP Profile with SIP OPTIONS Ping Enabled Checked and enter appropriate values for the corresponding parameters.
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