We're looking to implement DID calling. Our local provider has indicated they can provide this via a SIP trunk, but cannot provide an E1. We also don't think they can provide an E1-over-SIP (where they convert a TDM signal to SIP on their end).
For various unrelated (non-technical) reasons, we cannot connect a SIP trunk to our PBX, only an E1/T1.
Question: Do solutions exist that would allow us to convert a straight SIP trunk to a TDM E1 for connection to our PBX? What are some examples?
The PBX is a Meridian Option 11C, if that matters.