Which command will most likely resolve the issue?

An IP phone user cannot log in to their Cisco Unity Connection voice mailbox with their PIN. Which command will most likely resolve the issue?

A.
dtmf-reIay rtp-nte

B.
mgcp dtmf-relay CODEC all mode out-of-band

C.
dtmf-relay h245-alphanumeric

D.
dtmf-relay sip-notify

Explanation:
wrong in AT. StudentGuide Volume 1 Page 2-165

The user cannot login via PIN.
– Users might have entered the wrong PIN.
– DTMF tones are not transmitted.
* ForSIP phones, use the dtmf-relay rtp-nte command.
– The account is locked because the wrong PIN was entered.

This issue typically happens with Session Initiation Protocol (SIP) phones on Cisco Unified Communications Manager Express. Verify the directory number configuration on Cisco Unified Communications Manager Express for the following command:

voice register pool 1
id mac 0024.C445.5561
type 7965
number 1 dn 1
dtmf-relay rtp-nte

Without the dtmf-relay rtp-nte command, no DTMF tones are sent. For Skinny Client Control Protocol (SCCP) phones, the DTMF tones are sent correctly by default.