0x904D Signaling Gateway Query

Used in:
NGA Configure Query message

Byte | Description
0, 1 | Tag 0x904D
2, 3 | Length 0x0003
4 | Value[0] Mode 0x01 - M3UA AS Mode Override 0x03 - M3UA AS Mode Broadcast
5 | Value[1] Number of Signaling Gateway Processes
6 | Value[2] Signaling Gateway Process ID

See Application Server.
A device that translates calls between an IP network and another network, typically the PSTN.