![]() All dial plan functionality is contained in the CUCM cluster with an SCCP phone.Ī user dialing an international pattern that is denied by the end user's CoS deployed in CUCM will result in the reorder tone ie busy signal that is played to the calling party letting the party know that the "Call could not be completed as dialed". ![]() Note: - It is not possible to configure dial plan information (dial rules) on Cisco IP Phones using SCCP. Skinny Client Control Protocol (SCCP) is a stimulus/response protocol where the endpoint sends user input (stimulus) and expects some type of response from the server instructing the endpoint about what to do.All the call progress feedback provided by CUCM to the end user on the Cisco IP Phone, Screen display messages showing calling or called party, dial tone, secondary dial tone, ring back, reorder tone and so on is initiated by an SCCP message sent from CUCM to the Cisco IP Phone.Each event is reported to CUCM in real time. A user goes off-hook and then dials extension 1000. As soon as the user goes off-hook, a signaling message is sent from the phone to the CUCM server with which it is registered.Type A phones.Ĭisco IP Phones using SCCP, TCP port 2000 report every user input even to CUCM immediately. KPML is not supported on older SIP Phones. Cisco SIP Phones that support KPML use digit-by-digit dialing by default. Call came from an SIP Phone using KPML, CUCM receives, interprets and analyzes the dial plan on a digit-by-digit basis. It is nothing but Keypad Markup Language (KPML). SIP Phones: Enbloc, KPML (default on newer phones), SIP dial rules. ![]() SCCP & SIP Phone Digit forwarding methods IP Phone, SCCP & SIP Phone Registration Process with CUCM Refer the below link to understand the SCCP & SIP Phone Registration Process. It explains the working concept of the SCCP & SIP Phones and the Dial rules, digit forwarding methods to initiate a call.Īs a prerequisite understand the IP Phone Registration Process. This document intends to help the beginners to understand the basics of IP Telephony. SCCP & SIP Phone Digit forwarding methods. ![]()
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