Specifications

TD 92326GB
2009-03-10 / Ver. E
Installation and Operation Manual
VoIP Gateway
141
• If it is necessary to modify call number processing, then add CGPN Maps and make the
entries, see 21 Considerations on the Configuration of Call Routing on page 144.
• If calls from external gatekeepers are also to have access to the VoIP Gateway's ISDN
interfaces, define the voice transmission parameters (see section 19.1.5 Voice Transmission
on page 137).
19.3 Routing via the ENUM protocol
Another option for routing calls is to use the ENUM protocol. ENUM is a protocol, that
maps E.164 numbers (public switched network numbers) to Uniform Resource Identifiers
(URI). With the help of the ENUM protocol, it is possible to check whether a number can
be called via a cost effective Internet connection, or rather via an ISDN connection. Refer
to www.enum.org for more information.