Enable this flag to support the multiple contacts per Address Of Record (AoR).
- Disabled – Only a single contact per AoR is supported.
- Enabled (default) – The SBC maintains different Registration Control Blocks (RCBs) for each new registration and verifies the source IP address and port during RCB lookup.
The SBC supports validating the source IP address and the port even if Multiple Contacts Per Aor is Disabled. The SBC also supports locating the RCB using the AoR to perform additional validation on the source IP address and port if you set the option Require Registrationto "required" or "required-non-priority". This is applicable for both calls and out-of-dialog (OOD) requests that are originated from the IAD.
For refreshing registration that originates from a different IP/port, the SBC forwards the request to the registrar and moves the state to "UPDATING". Validate any calls or OOD requests that originate from the IAD while the RCB is in updating state, using the previously authenticated IP/port.
When Multiple Contacts Per Aor is Enabled, the SBC maintains different RCBs for each new registration. The SBC considers a new registration when the source IP/port of the REGISTER request is different from an earlier registration for the same AoR. Any of the registered UEs may initiate a communication on behalf of the AoR. The SBC fetches the corresponding RCB based on the source IP/port of the UE.
NOTE: Even though the default value of Multiple Contacts Per Aor is Enabled, during an upgrade, the value can be either "Enabled" or "Disabled".
Refer to Multiple Contacts per AoR for additional details.