Specifications

Configure E1 R2 Voice Ports

Voice over IP for the Cisco AS5300 15

Verify ISDN PRI Conﬁguration

You can check the validity of your voice port conﬁguration by performing the following tasks:

• Use the show voice port command to verify that the data conﬁgured is correct.

• If you have not conﬁgured your device to support direct inward dial (DID), dial in to the router

and see if you have dial tone.

• Enter a DTMF digit. If the dial tone stops, you have two-way voice connectivity with the router.

Tips

If you are having trouble connecting a call and you suspect the problem is associated with voice-port

conﬁguration, you can try to resolve the problem by performing the following tasks:

• Ping the associated IP address to conﬁrm connectivity. If you cannot successfully ping your

destination, refer to the “Conﬁguring IP” chapter in the Cisco IOS 12.0 Network Protocols

Conﬁguration Guide, Part 1.

• Determine if the VFC has been correctly installed. For more information, refer to Installing

Voice-over-IP Feature Cards in Cisco AS5300 Universal Access Servers, which came with your

voice network module (VNM).

• Use the show vfc slot number command to learn if the VFC is operational.

• Use the show isdn status command to view layer status information. If you receive a status

message stating that Layer 1 is deactivated, make sure the cable connection is not loose or

disconnected. (This status message indicates a problem at the physical layer.)

• With T1 lines, determine if your a-law setting is correct. With E1 lines, determine if your u-law

setting is correct. Use the cptone command to conﬁgure both a-law or u-law values. For more

information about the cptone command, refer to the “Command Reference” section of this

document.

• If dialing cannot occur, use the debug isdn q931 command to check the ISDN conﬁguration.

Conﬁgure E1 R2 Voice Ports

The Voice over IP VNM for the Cisco AS5300 supports E1 R2 signalling as well as ISDN PRI. R2

signalling is an international signalling standard that is common to channelized E1 networks.

However, there is no single signalling standard for R2. The ITU-T Q.400-Q.490 recommendation

10 pri-group timeslots range Conﬁgures ISDN PRI.

11 interface Serial0:23 Conﬁgures the IDSN D channel for the ﬁrst ISDN

PRI line. (The serial interface is the D channel.)

12 ip address ip-address Speciﬁes an IP address for the interface.

13 isdn incoming-voice {voice | modem} Enables incoming ISDN voice calls.

14 interface Serial1:23 Conﬁgures the IDSN D channel for the second

ISDN PRI line.

15 ip address ip-address Speciﬁes an IP address for the interface.

16 isdn incoming-voice {voice | modem} Enables incoming ISDN voice calls.

Step Command Purpose