tree a803c63fe0e9778d5b1ac9bce464b3e4d33a6d06
parent 815124952bf6070f9baf72b40333492520ebd882
author Neels Hofmeyr <nhofmeyr@sysmocom.de> 1489677274 +0100
committer Neels Hofmeyr <neels@hofmeyr.de> 1503848696 +0200

mgcp: hack RAB success from nano3G: patch first RTP payload

The ip.access nano3G needs the first RTP payload's first two bytes to read hex
'e400', or it will reject the RAB assignment. Add flag
patched_first_rtp_payload to mgcp_rtp_state to detect the first RTP payload on
a stream, and overwrite its first bytes with e400. This should probably be
configurable, but seems to not harm other femto cells (as long as we patch only
the first RTP payload in each stream). Only do this when sending to the BTS
side.

Related: OS#2459
Change-Id: I5eff04dcb0936e21690e427ae5e49228cd459bd4