tree c28dd6dde49d1b3cbefd0248437ad131aee5a189
parent f7d3251d9ac4ba29fc2cebc55106c2400d8a9423
author Neels Hofmeyr <neels@hofmeyr.de> 1554172015 +0200
committer Oliver Smith <osmith@sysmocom.de> 1554791637 +0200

USSD: fix routing to multiple MSC

hlr_ussd.c so far hardcoded osmo-msc's default IPA-name and hence was
only able to negotiate USSD sessions to
- a single osmo-msc
- that has no custom IPA-name set.
Fix: correctly route USSD to any number of MSC with any custom IPA
names.

Resolve the right MSC's IPA name from the USSD session's IMSI, using
hlr_subscriber->vlr_number to determine the right GSUP peer. Cache it in
ss_session->vlr_number to have at most one db hit for routing per
session.

Related: OS#3710
Change-Id: I18067bfadd33a6bc59a9ee336b6937313826fce3