tree 55defa419c559424639d4825897fdec326dd111a
parent 7066af825acddcd6b4dcf7bf3074f00b454b3ae3
author Neels Hofmeyr <neels@hofmeyr.de> 1532363344 +0200
committer Neels Hofmeyr <neels@hofmeyr.de> 1532363543 +0200

IuUP hack: make RTP patching less general

We currently still patch over an RTP message to make it look like an IuUP
Initialization Ack specifically for the ip.access nano3G femto cell.

Be more specific about it:

- only patch over RTP in 'loopback' mode. osmo-msc specifically leaves the
  endpoint in loopback mode for this hack, so if we're not in 'loopback', then
  this hack is out of place.

- only patch over RTP if the header indicates an IuUP Initialization (check for
  0xe4 byte).

Change-Id: Ia9ec4debc138b34f6ca6a871a8778eafa6c0ba21