My point still stands however - there are few SIP phones out there, and the ones that are being used are almost exclusively being used by the provider.
And again, I think looking at SIP just for phones is beside the point. SIP has much more potential. Phones are really just a sideshow for SIP. ""Art Barrera"" wrote in message news:[EMAIL PROTECTED] > Sprint PCS is in development of their "Push to Talk" product for > walkie-talkie style service for their customers. SIP is being used for call > setup and other controll funtions. > > SIP is running on the handset itself and SIP proxy servers located at > Sprint's distribution centers connecting to PTT Aplications Servers. > > Although troubleshooting becomes easier due to ASCII based messages used for > negotiation (easily "read" with a sniffer), the protocol is "heavy" for CDMA > (LOTS of activity) which is used on the PCS network. Other enhancements are > being used to reduce latency with call setup and floor control during a > session that ironicly are not SIP based i.e. using the RTP stream for > control functions and some fancy buffering to improve the user experience. > > > > > ----- Original Message ----- > From: "nrf" > To: > Sent: Wednesday, March 05, 2003 9:50 PM > Subject: Re: IP Telephony SIP [7:64433] > > > > SIP servers - Sonus, Clarent (I think), Nortel, Indigo, guys like that. > > > > SIP phones used by providers - practically none. Dont' get me wrong - > there > > are SIP phones out there. But phones are not really the point of SIP. > SIP > > is a generalized control plane that extends far and beyond phones. Right > > now, SIP is mostly being exploited by mobile carriers for back-end > > interoperability. SIP is also being exploited to facilitate rich instant > > messaging (consider RFC 3428). > > > > > > ""supernet"" wrote in message > > news:[EMAIL PROTECTED] > > > Thanks. What SIP servers and SIP phones do service providers use? > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > > > nrf > > > Sent: Tuesday, March 04, 2003 10:03 PM > > > To: [EMAIL PROTECTED] > > > Subject: Re: IP Telephony SIP [7:64433] > > > > > > ""supernet"" wrote in message > > > news:[EMAIL PROTECTED] > > > > Can anyone kindly enough tell me why SIP is better than CCM? What's > > > the > > > > main difference between this two? Is there any SIP in production? > > > > Thanks. Yoshi > > > > > > You shouldn't compare SIP and CCM. SIP is an industry standard, whereas > > > CCM > > > is a Cisco product. Any vendor, including Cisco, can and has > > > implemented > > > SIP. Only Cisco can 'implement' CCM (after all the first 'C' stands for > > > Cisco). > > > > > > There is a significant amount of SIP in production - almost all of it in > > > service-providers. Most of today's 3G wireless networks, for example, > > > rely > > > on SIP. > > > > > > To make things more confusing, Cisco may implement SIP within CCM soon. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=64635&t=64433 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
