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Bug #4153

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3G voice broken with ALu 9361 femto

Added by dev_zzo over 2 years ago. Updated 6 months ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
08/15/2019
Due date:
% Done:

0%

Spec Reference:

Description

Hello,

I am trying to create a setup with various Osmocom components to get the Alcatel-Lucent 9361 femtocells I have to function as a small 3G network. Currently, I am experiencing issues with 3G voice calls, quite similar to the ones described in #3411 / #2459 / #1937: the voice call is dropped.

I have traced the issue to the following code: https://github.com/osmocom/osmo-mgw/blob/9aaaab6b3b5a541a6c17077f5f1f8bc00ba77152/src/libosmo-mgcp/mgcp_network.c#L873

The femtocell rejects the IuUP message due to a CRC mismatch and indeed, when the bytes are patched, the header CRC is not updated and therefore cannot match.

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