SIP trunk calls are disconnected on Mitel phone EXTs and Analog phone EXTs

[hvm2809]

# The system information:
- MiVoice Business Release level: 10.0 SP1
- Active software load:10.0.1.22 (21.0.1.50)
- Platform: SMBC 7963MB of RAM

# The incoming and outgoing calls via CO line / Analog trunk is OKI

# The PROBLEM with SIP trunk calls:
- Incoming / outgoing calls to / from a SIP phone EXT is OKI
- Incoming calls to a Mitel 5300, 6900 or Analog device EXT: the EXT rings -> picks up handset -> call is disconnected
- Outgoing calls from phone 5300, 6900 or Analog EXT: called phone rings -> answer -> call is disconnected

Please give me advice and support?

Thank you very much in advance!
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[sunspark]

do you have any pcap trace ?

[johnp]

If the phone rings, means the setup for the call is good, after the audio will stream from the set to whatever called. I agree a pcap will help.

[ZuluAlpha]

Is the call actually disconnected or is it a no audio situation?