If no SIP dial rules are configured on an IP phone, at which three points in the collection of digits does a Type A SIP phone send digits to the Cisco Unified Communications Manager? (Choose three.)

The correct answer is A. when the interdigit timer expires C. when the user presses the Dial softkey E. when the user presses the # key. A Type A SIP phone collects all digits locally before sending them to CUCM (unlike SCCP phones that send digits one at a time). Without SIP dial rules configured, the phone has no pattern to match against, so it relies on three triggers to know when to send: (A) the interdigit…

Endpoints

Question

Options

Awhen the interdigit timer expires
Bwhen the collected digits match a SIP dial rule
Cwhen the user presses the Dial softkey
Das each digit is collected (it is sent for analysis)
Ewhen the user presses the # key

How the community answered

(18 responses)

A
94% (17)
B
6% (1)

Explanation

A Type A SIP phone collects all digits locally before sending them to CUCM (unlike SCCP phones that send digits one at a time). Without SIP dial rules configured, the phone has no pattern to match against, so it relies on three triggers to know when to send: (A) the interdigit timer expiring - no more digits entered after a timeout, (C) the user pressing the Dial softkey - explicit user action to send, and (E) the user pressing the # key - a common terminator signal. Option D (sending each digit as collected) describes SCCP/SKINNY behavior, not Type A SIP. Option B requires SIP dial rules to be present, which this scenario explicitly excludes.

Topics

#Type A SIP phone#digit collection#interdigit timer#en bloc dialing

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