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Which two features require or may require configuring a SIP trunk?

Which two features require or may require configuring a SIP trunk? (Choose two.)

PrepAway - Latest Free Exam Questions & Answers

A.
SIP gateway

B.
Call Control Discovery between a Cisco Unified Communications Manager and Cisco Unified
Communications Manager Express

C.
Cisco Device Mobility

D.
Cisco Unified Mobility

E.
registering a SIP phone

Explanation:
Incorrect answer: CDE
All protocols require that either a signaling interface (trunk) or a gateway be created to accept and
originate calls. Device mobility allows Cisco Unified Communications Manager to determine whether
the phone is at its home location or at a roaming location. Cisco Unified Mobility gives users the
ability to redirect incoming IP calls from Cisco Unified Communications Manager to different
designated phones, such as cellular phones.
Link:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_6_1/ccmsys/a08sip.html#wpxre
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