I am hoping this will somehow shed some light on why the RE-INVITE received on the CUBE from CUCM is using Delayed Offer (DO), when the initial invite received was Early Offer (EO)
In addition, I have contacted the Telco who confirms that they have an issue with one of their devices not advertising the configured codecs correctly. This causes calls to fail intermittently due to codec mismatch. They have escalated this issue to their hardware vendor.
I don't know the real reason why CUCM sent DO Re-Invite , maybe it require MTP to add SDP parameters in Re-Invite , that's why i asked this question to you "When you check MTP does this issue resolve ?"
As per my knowledge CUCM lacks the option or feature to manage Re-Invite messages (if anyone in this forum have any other view can put it).
This issue is certainly related to Telco as they are not handle their codec properly.
I believe cucm will always send a DO re-INVITE except in cases where it needs to break the media path in which case it needs to make the call inactive. The only way it can do that is to send an inactive attribute in its SDP. In other cases, ie to resume a call, to connect to the transferred destination, cucm will always use DO.
MTP will solve this issue because when MTP is involved a re-INVITE is not used, rather CUCM sends an UPDATE message to the CUBE.
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