[Serusers] How to get SER to REGISTER with another SER server

I have looked all over the docs and either I'm blind or SER can not initiate a REGISTER message every X seconds on its own to another SER server. Is there an external utility that does this for it? I am trying to avoid hard coding one of my customers IP addresses into my system. I basically want their SER server to REGISTER with my SER server as if it were an ATA. That way I don't have to make any custom entries into my configs for them. This is being used for wholesale purposes when the customer's SER box is servicing the end users (who have real ATA's) and I am handling all PSTN origination and termination for them. Thanks in advance! ---------------------------------------- Michael Shuler