Chapter 2: Webex Calling Design¶

This chapter is split into the following topics, each covering one stage of the Webex Calling design.

In This Chapter¶

Decision Area	Selection	Rationale
Platform	Webex Calling Multi-Tenant	Scale fits, cost-effective, cloud-native
Home Region	APAC (Mumbai + Chennai DCs)	Majority users in India
India PSTN	Local Gateway per circle	DoT compliance, existing contracts
EMEA PSTN	CCPP (IntelePeer)	No toll bypass, simplified management
Americas PSTN	CCPP (IntelePeer)	Simplified management, E911 support
India WFH	ITN Numbers	Toll bypass exempt, location-flexible
Extension Length	4 digits	Matches existing CUCM
ESN Format	8-XX-XXXX	Location routing prefix
Coexistence	CUBE trunk	Bidirectional CUCM<->Webex routing

This Chapter Section	Related Chapter	Related Section
2.1.3 Data Residency	Chapter 4	4.3 India Compliance, 4.4 EMEA Compliance
2.2.2 India Locations	Chapter 1	1.1 Site Inventory
2.3.2 Local Gateway	Chapter 5	5.5 Firewall Requirements
2.3.2 Zone/Edge	Chapter 4	4.3.2 Toll Bypass Prevention
2.4.4 Emergency Calling	Chapter 4	4.5 Americas Compliance
2.6 Coexistence	Chapter 7	7.2 Migration Procedures

Item	Configured	Verified
Location name	[ ]	[ ]
Site code	[ ]	[ ]
Street address	[ ]	[ ]
Timezone	[ ]	[ ]
Language	[ ]	[ ]
Extension range	[ ]	[ ]
OAC	[ ]	[ ]
PSTN type (LGW/CCPP)	[ ]	[ ]
Zone assignment (India)	[ ]	[ ]
Main number	[ ]	[ ]
Emergency callback	[ ]	[ ]
Hunt groups	[ ]	[ ]
Auto attendant	[ ]	[ ]
Call park range	[ ]	[ ]

Item	Mumbai	Chennai	Bangalore	Delhi	Noida	Hyderabad
Platform verified	[ ]	[ ]	[ ]	[ ]	[ ]	[ ]
IOS-XE 17.12+	[ ]	[ ]	[ ]	[ ]	[ ]	[ ]
Webex certificate installed	[ ]	[ ]	[ ]	[ ]	[ ]	[ ]
TLS profile configured	[ ]	[ ]	[ ]	[ ]	[ ]	[ ]
Tenant registered	[ ]	[ ]	[ ]	[ ]	[ ]	[ ]
PSTN trunk active	[ ]	[ ]	[ ]	[ ]	[ ]	[ ]
Test call Webex->PSTN	[ ]	[ ]	[ ]	[ ]	[ ]	[ ]
Test call PSTN->Webex	[ ]	[ ]	[ ]	[ ]	[ ]	[ ]

End of Chapter 2: Webex Calling Design