I am using a Callcentric DID in forwarded mode to my Voxalot acciunt.
I also have an ATA registering to my Callcentric account with an expiration time of 3 minutes. It seems to hold registration with no problem.
The ATA is connected to a FAX machine, and Callcentric support insisted I should set it to register for reliable faxing.
I had this set up quite a while ago, and I'd forgotten the actual details.
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