Default behaviour of a SIP phone is to download the dialplan on to the phone and do digit comparison in the phone itself. If the phone matches a pattern, it sends a SIP INVITE message to CM. An alternative to using SIP dial rules and downloading it to the phone is to use KPML . Only next gen phones such as 7941/61/70/71 support this.
With SIP unlike skinny, you have to use the dial softkey to send dialed digits to CM for digit processing. KPML helps doing this without having to use the dial soft key. KPML sends each digit to CM for processing as you are dialing it. CM will tell the phone to play reorder tone if it doesnt find a match.
Cisco phones such as 7940/60 etc does not support KPML so you will ahve to use SIP dial rules. For the same reason you will have to use the dial soft key to send digits to Callmanager.
With KPML, phones behave the same way like SCCP where each digit is sent to CM for processing. Remember while using KPML there is a lot of traffic going across to the CM so in high load environments, its recommended to use SIP dial rules.
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