Specifications
Configure E1 R2 Voice Ports
Voice over IP for the Cisco AS5300 17
Of the local variants listed above, the following local variants have been verified:
• Argentina
• Brazil
• China
• Mexico (Telmax)
• Singapore
• Thailand
R2 signalling is channelized E1 signalling used in Europe, Asia, and South America. It is equivalent
to channelized T1 signalling in North America. There are two types of R2 signalling: line signalling
and interregister signalling. R2 line signalling includes R2 digital, R2 analog, and R2 pulse. R2
interregister signalling includes R2 compelled, R2 noncompelled, and R2 semicompelled. These
signalling types are configured using the cas-group command.
Many countries and regions have their own E1 R2 variant specifications, which supplement the
ITU-T Q.400-Q.490 recommendation for R2 signalling. Unique E1 R2 signalling parameters for
specific countries and regions are set by entering the cas-custom channel command followed by the
country name command.
Cisco’s implementation of R2 signalling has dialed number identification service (DNIS) support
turned on by default. If you enable the automatic number identification (ani) option, the collection
of DNIS information is still performed. Specifying the ani option does not disable DNIS collection.
DNIS is the number being called. ANI is the caller’s number. For example, if you are configuring
router A to call router B, then the DNIS number is assigned to router B; the ANI number is assigned
to router A. ANI is similar to Caller ID.
Configure E1 R2 Signalling for Voice over IP
To configure E1 R2 signalling, use the following commands beginning in global configuration mode:
Step Command Purpose
1 controller e1 number Specifies the E1 controller that you want to
configure with R2 signalling.
2 cas-group channel timeslots range type {r2-analog |
r2-digital | r2-pulse}[dtmf | r2-compelled [ani] |
r2-non-compelled [ani] | r2-semi-compelled [ani]]
Configures R2 channel-associated
signalling on the E1 controller. For a
complete description of the available R2
options, refer to the cas-group (controller
e1) command in the Cisco IOS Release
12.0 Dial Solutions Command Reference.
3
cas-custom channel Enters cas-custom mode. In this mode, you
can localize E1 R2 signalling parameters,
such as specific R2 country settings for
Hong Kong.
For the customization to take effect, the
channel number used in the cas-custom
command must match the channel number
specified by the cas-group command.