An engineer is designing a new dial plan for a customer that has offices in several countries on four continents around the world. This client also wants to integrate with a Microsoft Lync backend. Which dial plan type should the engineer recommend?
A. SIP URI
B. TEHO
C. E.164
D. H.323
I agree with answer A.
You need to create a SIP trunk and a SIP route pattern between Mediation server and CUCM.
Lync Error When Using E.164 Numbers
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/im_presence/lync_integration/9_0_1/CUP0_BK_CE1362F3_00_lync-integration-guide-90/CUP0_BK_CE1362F3_00_lync-integration-guide-90_chapter_01010.html
correct answer :
C. E.164
Why?