Telco is provide SHDL point-to-point connection with bit costly for voip, what is the best design with SHDL or for voip via WAN which would be the best solution, please light me on that.

Also please compare the three SHDSL cards, what is the difference between 2 wire and 4 wire. Could Please help us, not reply in one word.

It's all explained in the datasheet.

http://www.cisco.com/en/US/prod/collateral/modules/ps5949/ps7175/product_data_sheet0900aecd80581fa0.html

There is no "best solution" all depends by available telco services, and how much you can spend.

Thanks for the reply p.bevilacqua, could you please light me more about 2pair and 4 pair SHDSL card, I am not able to understand the difference between the them.

Two wires make a pair.

More the pairs, more speed or distance.

Probably your telco supports one ir two pairs only.

Thanks again for your reply, if my design supports 4 pair, but the teleco support 2 pair, the SHDSL connection will work or not, so the SHDSL card design should be according to teleco supports, could you please suggest me.

Yes, the card must be chosen according to telco offering, as mentioned already.

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