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Bug #6328
openChannel Mode Modify fails to modify the RTP payload type number
Status:
New
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
01/12/2024
Due date:
% Done:
0%
Spec Reference:
Description
if you look at the pcap in https://osmocom.org/attachments/7192 from #6258
you'll see that the Channel Mode Modify in packet 5368 changes the codec from GSM-FR to AMR,
but then the AMR payload in RTP continues to indicate PT=3 instead of the expected PT=112.
This is because osmo-bsc still fails to:
- tell the MGW about the changed codec and payload type number via MGCP MDCX
- tell the BTS to emit the changed payload type number via ipacc.MDCX
This should happen in lchan_fsm.c in lchan_fsm_wait_rsl_chan_mode_modify_ack() on rx of LCHAN_EV_RSL_CHAN_MODE_MODIFY_ACK.
The lchan_fsm.c should tell the lchan_rtp_fsm.c to change the payload type number and codec.
When lchan_rtp_fsm.c is done with both MDCX, it should signal LCHAN_EV_RTP_READY back to lchan_fsm.
Related issues
Updated by neels 7 months ago
- Related to Feature #6258: if MT call leg does not support the assigned codec, re-assign to a compatible codec added
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