Wrong routing inside SAG
Hello fellows.
Have you ever seen a routing problem where the SBC routes a call to SA2 from a SIP interface in the realm where SA1 resides? SA2 ignores the INVITE.
It looks like the problem appeared somewhere between SCZ9.2 and SCZ10.0. There were "to-addr" prefixes in the local policy toward that SAG before the upgrade from 9.2 to 10.0, and this misbehavior had never occurred.
After the upgrade, a new prefix was added to the "to-addr" list, and the SBC routes incorrectly only that particular prefix. All others are still routed correclty: either to SA1 or SA2.
The strategy inside the SAG is set to "roundRobin". When sipd selects SA1 for routing, everything works normally. The problem occurs only when SA2 is chosen for routing. Is there a limitation for SAG, that requires all "dest" session-agents to be in the same realm?