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Voice over IP (VoIP), Session Initiation Protocol (SIP), and Microsoft Lync

Last Modified: 2012-07-03
Some of my customers use VoIP phones and/or Microsoft Lync for communication, including Instant Messaging and video calls.  I want to recover their servers in my data center and allow them to continue using VoIP and/or Microsoft Lync.

I have everything in place to restore all servers, but I'm concerned that just the servers won't be enough -- what network gear or circuits, if any, would be required to make the above work?  I already have redundant Internet connectivity and firewall protection, but I don't want to have to pay to have a SIP circuit run to my data center, and I prefer not to have to host a lot of customer-specific network gear.

In order to provide proper MS Lync and/or VoIP functionality, would I have to have a handoff with the Local Exchange Carrier (LEC) or other carrier into the data center?  What might such a handoff look like (such as what equipment would facilitate this handoff, if required)?
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