Fax Server connect to ISDN BRI

Unanswered Question
May 29th, 2007

Hi,

I have t6he following:

A Callmanager receives call and sends it to a 2801 with BRI Voice card that is connected back-to-back with a Fax server.

The BRI card is configured as network side, and the fax server is user side.

I have done this configuration many times when connecting to PBX's but here I encounter problems.

Here is a piece of the configuration.

Only the first BRI port is configured.

I am living in Europe, so no spid is needed.

voice-card 0

dsp services dspfarm

!

!

voice call send-alert

!

voice service voip

allow-connections h323 to h323

h323

!

interface BRI0/2/0

no ip address

isdn switch-type basic-net3

isdn overlap-receiving

isdn protocol-emulate network

isdn layer1-emulate network

isdn incoming-voice voice

isdn skipsend-idverify

!

interface BRI0/2/1

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

!

voice-port 0/2/0

compand-type a-law

cptone GR

!

voice-port 0/2/1

compand-type a-law

cptone GR

!

dial-peer voice 100 pots

preference 1

destination-pattern 77...

port 0/2/0

!

Although the router is configured as network side, it can not bring up layer 2 correctly:

*May 29 10:44:16.476: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/2/0, TEI 64 changed to up

*May 29 10:44:16.476: ISDN BR0/2/0 Q921: Net TX -> UAf sapi=0 tei=64

*May 29 10:44:26.476: ISDN BR0/2/0 Q921: Net TX -> RRp sapi=0 tei=0 nr=0

*May 29 10:44:26.484: ISDN BR0/2/0 Q921: Net RX <- RRp sapi=0 tei=64 nr=0

*May 29 10:44:26.488: ISDN BR0/2/0 Q921: Net TX -> RRf sapi=0 tei=64 nr=0

*May 29 10:44:27.476: ISDN BR0/2/0 Q921: Net TX -> RRp sapi=0 tei=0 nr=0

*May 29 10:44:28.476: ISDN BR0/2/0 Q921: Net TX -> RRp sapi=0 tei=0 nr=0

*May 29 10:44:29.476: ISDN BR0/2/0 Q921: Net TX -> RRp sapi=0 tei=0 nr=0

*May 29 10:44:30.476: ISDN BR0/2/0 Q921: L2_EstablishDataLink: sending SABME

*May 29 10:44:30.476: ISDN BR0/2/0 Q921: Net TX -> SABMEp sapi=0 tei=0

*May 29 10:44:31.476: ISDN BR0/2/0 Q921: Net TX -> SABMEp sapi=0 tei=0

*May 29 10:44:32.476: ISDN BR0/2/0 Q921: Net TX -> SABMEp sapi=0 tei=0

*May 29 10:44:33.476: ISDN BR0/2/0 Q921: Net TX -> SABMEp sapi=0 tei=0

*May 29 10:44:34.476: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/2/0, TEI 0 changed to down

These messages repeat forever.

Does any one has an idea?

Thanks,

Jan

I have this problem too.
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Paolo Bevilacqua Tue, 05/29/2007 - 05:41

Hi,

seems like at some point the fax server stops sending RR and link drops. Can you verify the cabling (no ethernet cable must be used), and that fax server is configured for dynamic TEI?

Flemming Ortvald Tue, 10/07/2008 - 08:29

Hi

Anyone ever found a solution to this?

I have a similar setup, where an ISR2801 is connected B2B with a "brooktrout 114 card, with Faxmaker server software".

The customer experienced, that they have to place a call from isr to faxserver, before the system would work after a server restart.

Afer some test configuration changes on the ISR layer2 completely refuses to establish. both reloading ISR, rebooting server and doint "shut/no shut" on interfaces fail to improve things.

Please find config and debug in attached document.

p-siadoua Tue, 06/16/2009 - 01:36

Hi, have you ever found solution about your fax server?

I have to connect a fax server with VIC2-2BR NT/TE on a ISR3845, but i have no idea to how configure this. Can you give an example of configuration.

j.huizinga Tue, 06/16/2009 - 02:28

The problem I had was finally a problem with the ISDN card from the fax server.

You can configure the 3845 as an ordinary H323 or MGCP Gateway. Configure partitions and CSS on the callmanager and make sure the routing is correct, inbound and outbound.

JH

p-siadoua Tue, 06/16/2009 - 03:37

Did you used crossover cable to interconnect your fax server?

Thx

Pamela

p-siadoua Wed, 06/17/2009 - 01:14

I have configured my gateway ISR3845 in MGCP and i have done this conf iguration on my bri :

interface BRI0/2/0

no ip address

isdn switch-type basic-net3

isdn protocol-emulate network

isdn layer1-emulate network

isdn skipsend-idverify

line-power

but my layer 2 cannot established

have you ever had this same problem?

j.huizinga Wed, 06/17/2009 - 22:13

You are sure you are network side? Make sure that FAX server is user side.

Also you need ISDN cross cable for Cisco <-> FAX server

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