ATA Question

I am trying to trouble shoot a connection problem and have a question please.

A relative of mine has an Vonage ATA adapter.

When an outgoing call is made from the ATA, how is the dialled number processed ie does the ATA translate the number dialed into an IP address.

Cheers

http://en.wikipedia.org/wiki/Analog_telephone_adapter

Using such an ATA, it is possible to connect a conventional telephone to a remote VoIP server. The ATA communicates with the server using a protocol such as H.323, SIP, MGCP, SCCP or IAX, and encodes and decodes the voice signal using a voice codec such as G.711, G.729, GSM, iLBC or others. Since the ATA communicates directly with the VoIP server, it does not require a personal computer or any software such as a softphone.

Cheers