Internet Telephony Numbers for Webex Calling in India

In India, Department of Telecom (DOT) assigns special numbers known as Internet Telephony Numbers (ITN) to PSTN providers. Organizations with ITNs can access Webex Calling services through the Internet. Additionally, Webex Calling users in India who are assigned with these ITNs are exempted from toll bypass regulations as long as they remain within the country. For more information, see Internet Telephony Numbers for Webex Calling in India.

Benefits

Using ITNs for Webex Calling provides the following benefits:

Eliminate infrastructure costs—Avoid the expenses associated with MPLS, private networks or lease lines for connecting your organization's locations to Webex.
Enjoy unrestricted calling—Make and receive PSTN calls from anywhere in India without worrying about toll bypass restrictions.

Internet Telephony Numbers and zone configuration

If an organization uses only Internet Telephony Numbers at a Webex Calling location, the administrator is still required to configure the Zone and Trusted Network Edge settings for that location. The Zone and Trusted Network Edge setting should remain blank, without any specified IP addresses or subnets. If any IP address is configured in the Zone and Trusted Network Edge, it is ignored while applying toll bypass policies.

Administrators can add Internet Telephony Numbers in the Control Hub, and assign them to users, workspaces, devices, virtual lines, and features.

To add Internet Telephony Numbers in the Control Hub, see Manage phone numbers in Control Hub.

To assign Internet Telephony Number to a user or a workspace, see Assign phone number to a user or a workspace.

To assign Internet Telephony Number to a virtual line, see Multi line support in Webex Calling using virtual lines.

Call scenario examples

Let's consider the following examples to understand how Internet Telephony Numbers impact toll bypass policies:

The toll bypass policies are applied based on the country location data of the user.

Scenario	Number type assigned to India user	Condition/Outcome
Inbound Call	Fixed line number	A PSTN caller calls an India user's fixed line number; clients and devices roaming outside the location's zone are not alerted.
Inbound Call	Internet Telephony Number	A PSTN caller calls India user, clients and devices roaming outside India are not alerted.
Outbound Call	Fixed line number	PSTN call from a user with a fixed line number in India is rejected if the user is roaming outside the zone.
Outbound Call	Internet Telephony Numbers	PSTN call from a user with an Internet Telephony Number in India is rejected if the user is roaming outside India.
Work from anywhere in India	Fixed line number	A user assigned with a fixed line number must be connected to the office network using a VPN to make and receive PSTN calls.
Work from anywhere in India	Internet Telephony Numbers	A user assigned with an Internet Telephony Number can make and receive PSTN calls without being connected to the office network via VPN.
Redirection → Call-forwarding	Fixed line number to a fixed line number	Call-forwarding is permitted when the user forwarding the call is in the same zone as the user that the call is being forwarded to.
	Fixed line number to an Internet Telephony Number	Call-forwarding is permitted if forwarding target's client and the device are not roaming outside India.
	Internet Telephony Number to a fixed line number	Call-forwarding is permitted when the user forwarding the call is in the same zone as the user that the call is being forwarded to.
	Internet Telephony Number to an Internet Telephony Number	Call forwarding is permitted when the target user’s clients and devices are not roaming outside India.
Redirection → Attended Transfer	Transferor with a fixed line number	Attempt to transfer a call to a user that is assigned a fixed line number in a different zone fails.
	Transferor with a fixed line number	Attempt to transfer a call to a user assigned with an Internet Telephony Number is successful unless the target user’s clients and devices are not roaming outside India.
	Transferor with Internet Telephony Number	Attempt to transfer a call to a user in India who is assigned an Internet Telephony Number is successful.
	Internet Telephony Number	Attempt to transfer a call to a user in India with a fixed line number is successful if the transfer target user is in the same zone as the transferring user.
Conference Call	Conference initiator on a fixed line number	There is an active call between a PSTN user A and Webex Calling user B on a fixed line number. Webex Calling user B tries to add another fixed line number C to escalate call to a conference. A conference call is allowed only if C is in the same zone as B.
	Conference initiator on a fixed line number	There is an active call between a PSTN user A and Webex Calling user B on a fixed line number. Webex Calling user B tries to add user C that is assigned with an Internet Telephony Number to escalate call to a conference. A conference call is allowed only if C is in any location in India.
	Conference initiator on an Internet Telephony Number	There is an active call between a PSTN user A and Webex Calling user B on an Internet Telephony Number. Webex Calling user B tries to add another user C with Internet Telephony Number to escalate call to a conference. A conference call is allowed if C is in any location within India.
	Conference initiator on an Internet Telephony Number	There is an active call between a PSTN user A and Webex Calling user B on an Internet Telephony Number. Webex Calling user B tries to add another user C with a fixed line number to escalate the call to a conference. A conference call is allowed only if user B’s location is in the same zone as user C.
Call Park	Retrieve from a fixed line number	Retrieval is allowed if the user retrieving the call is in the same zone as the user who parked the call.
Call Park	Retrieve from an Internet Telephony Number	Retrieval is allowed if the user retrieving the call is in any location in India, attempt to retrieve the call fails if clients and devices of the user are roaming outside India.
Call Pickup	Pickup from a fixed line number	Call pickup is allowed if the user that is picking the call is in the same zone as the called user.
Call Pickup	Pickup from an Internet Telephony Number	Call Pickup is allowed if the user that is picking up the call is in any location in India, attempt to pick up the call fails if clients and devices of the user are roaming outside India.
Single Number Reach (SNR)	Call from a fixed line number	User A with fixed line number calls Webex Calling user B who has SNR configured. SNR Number is alerted if user A and user B are in the same zone.
Single Number Reach (SNR)	Call from an Internet Telephony Number	User A with Internet Telephony Number calls Webex Calling user B who has SNR configured. SNR Number is alerted if user A’s clients and devices are not roaming outside India.
Executive or Executive-Assistant	PSTN call to an executive with an assistant that is assigned with a fixed line number	Call is alerted to the assistant if the executive and assistant are in the same zone.
	PSTN call to an executive with an Internet Telephony Number assistant	Call is alerted to the assistant if located in India.
	Assistant with a fixed line number calls PSTN on behalf of an executive	Call is allowed if the executive and the assistant are in the same zone.
	Assistant with Internet Telephony Number calls PSTN on behalf of an executive	Call is allowed if the assistant is in India.

Call Detail Records (CDR)

In Webex Calling, the Call Detail Record (CDR) records the public IP addresses of devices used for making and receiving calls. The field names are Public Calling IP Address, and Public Called IP Address and will have values when calls are made by users in India. For other countries these fields, do not have any values.

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Internet Telephony Numbers for Webex Calling in India