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Phone registration

hi guys, i want to place CCM 5.0 at my main site whereas the small branches can use CME, but the problem is that i m using 1861 and the number of ip phones is limited, so lets assume that 1861 supports only 10 ip phones, and i have 15 ip phones in the branch then 5 of them will not be functional am i right ?? i asked a voice professional and he said that phones ALWAYS require registration from the SIP server ( if they are sip based ) but i have used linksys phones which have an option that makes them call without registration, but many voice experts dont accept it, i want to know that do u guys know of any vendor's ip phones that first tries to connect to sip server and if it fails it transition to call without registration, i know this feature is not available in cisco so any other vendor ??

thanks

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