SIP & SCCP Phone flow CUCM

Here are some flows of a SIP & SCCP phone call. My purpose was to see is it really only digit-by-digit dialing even when the phone is on hook.

SCCP

on-hook dialing : EnBloc

off-hook dialing : Digit by Digit

SIP

type B on-hook dialing no dial-rules : EnBloc

type B off-hook dialing no dial-rules : Digit by Digit with KPML event

SCCP

Normal off-hook (Digit by Digit):

sccp-normal-off-hook

Normal on-hook : (Enbloc)

sccp-normal-on-hook

Delete a number while dialing, off hook :

sccp-delete-off-hook

Change number during dialing, on hook :

sccp-delete-on-hook

SIP

off-hook normal dialing :

sip-offhook-no-dialrules

off-hook with BackSpace during dialing :

sip-offhook-no-dialrules-bs

on-hook normal :

sip-onhook-no-dialrules

on-hook with BackSpace :

sip-onhook-no-dialrules-bs

When you use a SIP phone with Dial-rules, it’s Enbloc !

  • Type A SIP Phones: Cisco Unified IP Phone models 7905, 7912, 7940 and 7960
  • Type B SIP Phones: Cisco IP Phone models 79×1, 79×2, 79×5, 7970 and 7960

Type A phones only support enbloc dialing when using SIP firmware.

More information can be found at the Cisco site : https://supportforums.cisco.com/document/87236/working-concept-sccp-sip-phones-and-dial-rules

2 Comments

  1. Thank you for this! Saved me the trouble of pulling the traces. All official documentation references SCCP calls while made off-hook but does not address the on-hook dialing scenarios that are important to remember.




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