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488 "Not Acceptable Here" on SRTP/TLS re-invites

edited Jun 20, 2016 7:10PM in Acme Packet (MOSC) 2 commentsAnswered

Hi everybody,

I've just set up one of our SBC to works with TLS and SRTP in both directions (PBX uses RTP & SRTP <-> SBC <-> Provider uses SRTP only) and got the following issue:

1. Provider Call to SIP Phone

2. Phone Answers -> everything is working

3. Phone puts Caller on hold (SIP re-invite) -> also working. Caller hears waiting Music.

4. Phone want to get caller back (SIP re-invite) -> Call is dropped after SBC issues 488 to PBX

Does anyone have any clue why the 488 is sendet? I would appreciate any help

For better understanding the relevant SIPMSG:

56:07.573 On 172.X.X.3:5061 received from 172.X.X.1:43904

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