Bygcland

My company has been looking at using SIP trunks thru our Provider (level3). The problem is that Level3 says they need to put a Cisco Call Manager at our site to do the integration since that is the only system they have certified their SIP trunking with. I really don't want to have to do that. When I questioned the Enginee with Level 3 if they would be interested in maybe certifying their product on the NEC SV7000, they kind of just shrugged their shoulders. I really dont' want to have to put 7 T-1's between us and the Call Manager just to get that working. You know what I mean?

bcrawfo2

Wow,
That doesn't seem like a good plan. I tell you...a CCM would introduce a whole new set of problems.
I don't know anything about the NEC PBX you mentioned....I've integrated Nortel MCS, Nortel CS1k, CCM v4, CCM v5, a Mitel and an Asterisk box to a central SIP provider.
I am learning that you can tweak just about anything you want.
I'd push your provider to do a direct integration with you (if you are comfortable with it security-wise)...or possibly using some type of SBC yourself. A Cisco router running their IP-IP-gw software could even qualify.



I've worked with Verizon on their IP trunking service and they don't give you a lot of flexibility. They require you to define your concurrent calls by location just as you would with TDM circuits. This kinda defeats a lot of the flexibility of a large central trunk.
Also worked with Global Crossings on their IP trunking. They seemed to be a little more advanced, but still had limitations on how they could send/receive DTMF. I really never knew that was so hard. I'm learning more about it now, but at the time it seemed so simple.