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If I have multiple SIP Signaling Ports configured in a Zone, which is the source IP when sending a request to a peer?

As a best practice, Sonus Ribbon recommends configuring one signaling port per zone. The SBC chooses a port (usually the first port) in the zone for outbound connections. However, the SBC cannot enforce the use of a specific signaling port within the zone to initiate a call on a trunk group. The trunk is assigned to a zone and not to a signaling port in the configuration model.  To associate a unique source port for each trunk group, create separate zones defining a single signaling port per zone.

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The OIDs are indexes in the MIB tables, and indexes are not readable using SNMP GET requests. The SNMP GETNEXT requests are used to find out what indexes are currently present in the MIB tables. For more information, refer to the section How to Retrieve Sonus Ribbon Enterprise MIB OIDs.