[MERGED] osmo-gsm-manuals[master]: mncc.adoc: clarify MNCC_BRIDGE, with future outlook

Neels Hofmeyr gerrit-no-reply at lists.osmocom.org
Mon Oct 2 14:29:21 UTC 2017


Neels Hofmeyr has submitted this change and it was merged.

Change subject: mncc.adoc: clarify MNCC_BRIDGE, with future outlook
......................................................................


mncc.adoc: clarify MNCC_BRIDGE, with future outlook

Change-Id: Ic71a83d71f2da87e1066fcc060b2b942643eddbc
---
M common/chapters/mncc.adoc
1 file changed, 14 insertions(+), 2 deletions(-)

Approvals:
  Harald Welte: Looks good to me, approved
  Jenkins Builder: Verified



diff --git a/common/chapters/mncc.adoc b/common/chapters/mncc.adoc
index 74ca6cf..77579a5 100644
--- a/common/chapters/mncc.adoc
+++ b/common/chapters/mncc.adoc
@@ -131,8 +131,20 @@
 
 Requests that the TCH (voice) channels of two calls shall be
 inter-connected.   This is the old-fashioned way of using MNCC,
-primarily required for circuit-switched BTSs whose TRAU frames are
-received via an E1 interface card on the {program-name} machine.
+historically required for circuit-switched BTSs whose TRAU frames are
+received via an E1 interface card, and works only when the TCH channel types
+match.
+
+NOTE: Internal MNCC uses MNCC_BRIDGE to connect calls directly between
+connected BTSs or RNCs, in effect disallowing calls between mismatching TCH
+types and forcing all BTSs to be configured with exactly one TCH type and
+codec. This is a limitation that will probably remain for the old OsmoNITB. For
+the new OsmoMSC, the MNCC_BRIDGE command will instruct the separate OsmoMGW to
+bridge calls, which will be able to handle transcoding between different TCH as
+well as 3G (IuUP) payloads (but note: not yet implemented at the time of
+writing this). Hence an external MNCC may decide to bridge calls directly
+between BTSs or RNCs that both are internal to the OsmoMSC, for optimization
+reasons.
 
 ==== MNCC_FRAME_RECV
 

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Gerrit-MessageType: merged
Gerrit-Change-Id: Ic71a83d71f2da87e1066fcc060b2b942643eddbc
Gerrit-PatchSet: 1
Gerrit-Project: osmo-gsm-manuals
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Neels Hofmeyr <nhofmeyr at sysmocom.de>


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