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The 2100 supports SIP v2 for call setup and control and G.711 (A and µ law), G.726 (16 / 24 / 32 / 40 kbps), G.729 A and G.723.1 (6.3 and 5.3 kbps) voice codecs. Its PDF spec sheet also details a host of other features including support for SIP proxy redundancy, STUN, and encrypted calling via "pre-standard implementation of secure RTP". Two flavors of QoS are also supported - CBQ (Class Based Queueing) and TBF (Token Bucket Filter).

A cruise through the various Voice configuration screens can be intimidating for a VoIP newbie like myself, especially the Admin mode Advanced screens. As I said, I'm no SIP or VoIP expert, but the 2100 seems to provide a very wide array of configuration options - too extensive to cover within this review. As just a taste, Figure 6 shows part of the Advanced SIP config page and Figure 7 part of the Advanced Line page.

Admin level Advanced SIP settings

Figure 6: Admin level Advanced SIP settings
(click image to enlarge)

Admin level Advanced Line settings

Figure 7: Admin level Advanced Line settings
(click image to enlarge)

I suggest you download the ATA User Guide and 2100 Administrative Supplement (PDF links) if you really want the details on the configurability the 2100 provides.

While all of this looks pretty daunting, the 2100's Provisioning features support automated remote provisioning and upgrade via HTTP, HTTPS or TFTP downloads. For example, in my test of BroadVoice's Bring Your Own Device service, I was able to download a 2100 configuration file from Broadvoice, enter my account info and be up and running. In other cases, most of the defaults will probably work and you'll only have to enter some info in the Proxy and Registration and Subscriber Information portions of the Line page.

Once I was up and running, the 2100 pretty much disappeared in that it just worked. In weeks of light use, I don't recall having it lock up or need to be rebooted, even once.

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