IP Telephony and Phones

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Hi, I have one site consisting of 250 users and 2 sites. Regardless of geographical location, what is the best practice of design. I mean to say, Shall we go for server based solution or router based solution.and what other parameters do we need to c...

techguy by Level 4
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 I have voice router 2921 CME 9.5 .My ip phones registered in it.I have configured telephony-service.But my phones shows me different time than in configured CME.some of them can display 2 hour difference  ,another 6 hours.I tried to upgrade phones f...

Resolved! sip trunk

dear all i have a cisco router 2811  i need  to config sip trunk and  call through  fastethernet  port  is that Possible  or  must have e1/t1 card   if possible  please help   thank you