SIP Trunk Disables Itself

[imvpbxuser]

Our phone vendor added a SIP trunk to our Mitel 5000 config last week. Yesterday we found it lifeless, and after extensive troubleshooting (no calls coming in or out on it), we discovered the SIP Trunk's Operating State value had changed to 'Out-of-Service'. No human intervention - i swear. Has anyone seen this condition? Can sensed errors, etc. trigger a change dynamically like that? Our phone vendor hasn't seen it before - thought I'd throw it out to y'all. We changed it back to 'In-Service' and it's working fine for now. Appreciate any feedback.

[NTEDave]

If the system can't 'see' the SIP trunk platform it will eventually put itself out of service. Have you had connectivity issues to the internet / SIP trunk provider??

[imvpbxuser]

Thanks for the reply, NTEDave. Well, the SIP trunk rides atop the DIA service (Level 3), and our netmon processes never saw that go down, so I'm thinking no. But still, good to know that putting itself out of service is at least possible.