6.2.3 Remote NA(P)T traversal support procedure

23.3343GPPIP Multimedia Subsystem (IMS) Application Level Gateway (IMS-ALG) - IMS Access Gateway (IMS-AGW) interface: Procedures descriptionsRelease 17TS

This procedure is identical to that of clause 6.2.1 apart from the IMS-ALG optionally indicating to the IMS-AGW that the remote media address/port information (supplied by the IMS-ALG) shall not be used as the destination address for outgoing media. Instead, the IMS-AGW shall "latch" or "relatch" onto the required destination address via the source address/port of the incoming media. The IMS-ALG may command the IMS-AGW to latch once (on the first received packet) or to re-latch (i.e. to check for a change of source address on the incoming media stream and latch once on this new address).