What's the design preference if going SIP? Our current design is 115 ISDN B channels(spread over 5 offices and over 1000 DID numbers spread over the 5 offices.) I've got a couple of quotes from Vendors. Some vendors outline to use our internet circuit others a Private MPLS connection to their SIP network. My preference would be a Private MPLS circuit to our two Data centers however I have to take into consideration the EF bandwidth I would need to the offices.
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