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Technology Stocks : Voice-on-the-net (VON), VoIP, Internet (IP) Telephony
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To: Frank A. Coluccio who wrote (1698)10/26/1998 11:35:00 AM
From: hal jordan  Read Replies (2) of 3178
 
Frank,

I've got some questions for you about how IP telephony would work in the context of xDSL and dslam technology.

Several xDSL vendors have announced products that have integrated RJ11 ports for telephones at the premise side and GR303 support at the dslam. Apparently, there are DSP codecs at the premise side that take in voice and convert it to ATM cells for transport over ADSL or SDSL to the dslam.

Frank, my questions are as follows:

1. How would support for voice features such as forwarding or busy tones be accomplished?

2. I'm sure the idea here is that the customer can eliminate separate T1 lines for voice by multiplexing the ATM based voice traffic in with the data traffic. What kind of interface or equipment would a customer based PBX and key system need to get the voice traffic to the xDSL modem with integrated DSP codecs?

3. What does a GR303 interface at the dslam buy the customer?

My interpretation is that the ATM conversion of voice traffic means the CLEC can multiplex both voice and data packet traffic through the backbone without needing 5Es or DMS at every CO, except at the final handoff in the megapop. I guess the IP gateway converts the IP/ATM to voice at that final handoff before hitting that 5E/DMS. Does this sound correct? Is SS7 support needed anywhere here?

Thank you in advance for any information.

Hal
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