Shulou(Shulou.com)06/01 Report--

1. Concept:

PRI is the most commonly used. T1 and E1 configurations are the same, but not as complex as CAS.

ISDN is a type of service, and the BRI,32B of 2B is called PRI, that is, E1. At present, many people use 30B+D in China, and ISP basically does not provide BRI services.

two。 The issues discussed are as follows:

Clock problem of T1 / E1

Pri0-group configuration of voice channels carried by digital lines

Debugging of Q.921 and Q.931 of ISDN / PRI

ISDN DNIS and DID

3. Topology Diagram:

R2 simulates the local end in the topology and is configured as follows:

Sh diag View the slot of E1 Interface Card

Isdn protocol-emulate network simulates the device of this interface as a network-side device

Card type E1 0 2 defines modules on slot 2 as E1 types

Network-clock-participate wic 2 turns on the clock function on VWIC slot 2

Network-clock-select 1 E1 0amp 2amp 0 configures the priority of the original clock

R2-Config

Card type E1 0 2

Network-clock-participate wic 2

Network-clock-select 1 e1 0/2/0

Controller e1 0/2/0

Frame crc 4

Linecode ami

Clock source internal

Pri-group 0 timeslots 1-6 / / this command automatically generates the virtual interfaces s0UniGur2UniGUR 15 and voice-port 0UniUnix 15, where the interface number is fixed, E1 voice-port 15, T1 voice-port 23. At this time, the number of timeslots is limited by the processing power of DSP / /

Isdn switch-type? / / maybe the features of IOS are different, some of which are NET5//

Basic-1tr6 1TR6 switch type for Germany

Basic-5ess Lucent 5ESS switch type for the U.S.

Basic-dms100 Northern Telecom DMS-100 switch type for theU.S.

Basic-net3 NET3 switch type for UK, Europe, Asia andAustralia

Basic-ni National ISDN switch type for the U.S.

Basic-qsig QSIG switch type

Basic-ts013 TS013 switch type for Australia (obsolete)

Ntt NTT switch type for Japan

Vn3 VN3 and VN4 switch types for France

Int s0/2/0:15

Isdn protocol-emulate network / / confirmed as office / /

Isdnincoming-voice voice / / default command, the incoming voice is handed over to DSP for processing / /

Dial-pvoi 1000 pots

Destination-pattern12341...

Forward-digitall / / forward all, which is equivalent to not checking account / /

Port0/2/0:15

Forward-digit4 / / reserved last 4 bits / /

Dial-p voi 2000pots

Detination-pattern2000

Port 1-0-0

R1-Config is basically the same as R2, except for the local office configuration.

Isdn switch-typebasic-net3

Card type E1 0 2

Network-clock-participate wic 2

Network-clock-select 1 e1 0/2/0

Controller e10/2/0

Frame crc 4

Linecode ami

Clock source line / / the clock source comes from the office / /

Pri-group 0 timeslots 1-6 / / consistent with the peer / /

Dial-peer voi 2000 pots

Destination-pattern 0T

Port 0/2/0:15

Dial-p voi 1000 pots

Destination-pattern 1000

Port 1-0-0

Check the connection of ISDN through sh isdn statues:

R1#sh isdn status

Global ISDN Switchtype = basic-net3

ISDN Serial0/2/0:15 interface dsl 0, interfaceISDN Switchtype = basic-net3

Layer1 Status: ACTIVE

Layer2 Status: TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

Layer 3 Status: 0 Active Layer 3 Call (s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x800FFFFF

Number of L2 Discards = 0, L2 Session ID = 47

Total Allocated ISDN CCBs = 0

As shown in the figure, the status of L 2 is MULTIPLE_FRAME_ESTABLISHED, indicating that the ISDN connection is normal.

Try 1000 to dial 2000 and find that you hear a "secondary dial tone" and the call cannot be established. Through debug q931, you can see that both plan and type are in unknown status.

Reason: the original behavior of PRI is to monitor the DTMF of B channel, but there is no DTMF in the connection phase, only signaling, at this time, the router does not find the corresponding number in B channel, so it sends a "secondary dial tone". At this time, the call number already exists, but in channel D, it is propagated through DNIS. This is what we call the "secondary dial tone" problem.

Solution: configure the DID function on R2 to listen for calling numbers in channel D. For DID, there are two functions, one is to monitor the DNIS in D channel, and the other is to dial in directly. The configuration is as follows:

R1 / R2:dial-p voi 1 pots

Incoming called-number. / / Please pay attention to this point, the meaning is to hit one person / /

Direct-inward-dial / / DID//

After configuring the above DID, try to make another call from R2 to 12341000 of R1 and find that it is not available at this time because R1 does not have a voice route to 12341000.

Settlement Act:

1. Manually add a voice route to R1, but in the actual production environment, there may be hundreds of phone numbers in the enterprise, which, if added one by one, will increase the workload of IT.

two。 Define conversion rules

Translation-rule 1max / define conversion rule 1max /

Rule 1 ^ 12341 1max / convert a number starting with 12341 to 1max /

Voice-port 0/2/0:15

Translate-called 1max / invokes conversion rule 1max / in the incoming direction of this interface

At this point, the phone can be connected, this translation rule is used to convert the inbound number, of course, can also be converted to the number. The conversion rules are described in the next section.

Some debugging commands:

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