Why can't I use a dialing interface(POTS or PRI) for multiple route groups? Basically, I have a few pots lines that I would like to use for initial 911 calls, then dump down to a PRI if the POTS line is being used already or otherwise can't handle the call. If I create a route group with the POTS gateway and then the PRI gateway, I cannot use the PRI gateway in any other route groups. Why is this?
If it is by design, how do people create route groups using the same interfaces, just in different priority orders depending on the callers class of service?
Thanks in advance.