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New Member

Super G3 to Super G3 FAX from FXS to BRI

Hi

Our customer is using CUCM 6.1 with ATA186 and 2811 H.323 (12.4(9)T) Gateways with ISDN BRI. Now they have installed a Super G3 FAX which can not be reconfigured to G3 speeds. Calls from that Super G3 FAX to other Super G3 FAXes don't work as the ATA186 does not support Super G3. Hence we inserted a VIC2-2FXS card in the gateway and configured it for SCCP with the CUCM and T.38 with "fax-relay sg3-to-g3". The FAX calls from the Super G3 FAX to other Super G3 FAXes still fail (calls are disconnected after approx. 8 sec). I think the fax relay configuration is not really used because when the call is established there is no VoIP call leg, just the 2 POTS call legs.

Has anyone successfully connected a Super G3 FAX to an FXS port an was able to fax with other Super G3 FAXes over a ISDN interface on the same gateway?

If so, please let me now.

Many thanks in advance

Regards

Stefan

1 ACCEPTED SOLUTION

Accepted Solutions
New Member

Re: Super G3 to Super G3 FAX from FXS to BRI

My understanding is that SG3 is not supported under fax-relay/T38 only under passthrough. As SG3 uses special tones standard fax pass-through doesn't recognise the setup so you need modem passthrough. I hope that this helps. There is a very good fax book produced by Cisco Press - do you have Safari?

4 REPLIES
Cisco Employee

Re: Super G3 to Super G3 FAX from FXS to BRI

Following is a config for SCCP controlled faxing on the FXS port and MGCP controlled ISDN BRI. This had a SuperG3 fax on the FXS port 0/3/0 and worked fine at SG3 speeds after we added 'no fax-relay sg3-to-g3' under voice service voip settings. Putting this command back to the default would force the fax back to to normal T30 speeds.

Due to some other issues the customer later put the FXS port under MGCP control and this worked fine at SG3 speeds as well.

!

network-clock-participate wic 1

network-clock-participate wic 2

network-clock-select 1 BRI0/1/0

!

!

stcapp register capability 0/3/2 modem-passthrough

stcapp register capability 0/3/1 modem-passthrough

stcapp register capability 0/3/0 modem-passthrough

stcapp register capability 0/3/3 modem-passthrough

stcapp ccm-group 1

stcapp

!

stcapp feature access-code

prefix *

!

stcapp feature speed-dial

prefix #

!

isdn switch-type basic-net3

!

voice-card 0

no dspfarm

dsp services dspfarm

!

!

!

voice service voip

no fax-relay sg3-to-g3

modem passthrough nse codec g711ulaw redundancy maximum-sessions 5

!

!

interface BRI0/1/0

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn bind-l3 ccm-manager service mgcp

isdn static-tei 0

!

interface BRI0/1/1

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn bind-l3 ccm-manager service mgcp

isdn static-tei 0

!

!

voice-port 0/1/0

compand-type a-law

cptone AU

bearer-cap Speech

!

voice-port 0/1/1

compand-type a-law

cptone AU

bearer-cap Speech

!

!

voice-port 0/3/0

cptone AU

timeouts ringing infinity

timing hookflash-in 400 10

caller-id enable

!

voice-port 0/3/1

cptone AU

timeouts ringing infinity

timing hookflash-in 400 10

caller-id enable

!

voice-port 0/3/2

timeouts ringing infinity

timing hookflash-in 400 10

caller-id enable

!

voice-port 0/3/3

timeouts ringing infinity

!

ccm-manager fallback-mgcp

ccm-manager redundant-host X.X.X.X

ccm-manager mgcp

no ccm-manager fax protocol cisco

ccm-manager music-on-hold

!

mgcp

mgcp call-agent X.X.X.X 2427 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp rtp unreachable timeout 1000 action notify

mgcp modem passthrough voip mode nse

mgcp ip qos dscp cs3 signaling

mgcp package-capability rtp-package

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp package-capability fxr-package

mgcp package-capability pre-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax rate 14400

no mgcp fax t38 ecm

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static

mgcp bind control source-interface Loopback2

mgcp bind media source-interface Loopback2

!

mgcp profile default

!

sccp local GigabitEthernet0/1.300

sccp ccm X.X.X.X identifier 1 version 4.1

sccp ccm X.X.X.X identifier 2 version 4.1

sccp

!

sccp ccm group 1

associate ccm 1 priority 1

associate ccm 2 priority 2

!

!

dial-peer voice 51 pots

service stcapp

port 0/3/0

!

dial-peer voice 52 pots

service stcapp

port 0/3/1

!

dial-peer voice 53 pots

service stcapp

port 0/3/2

!

dial-peer voice 54 pots

service stcapp

port 0/3/3

!

New Member

Re: Super G3 to Super G3 FAX from FXS to BRI

Hi Paul

Thanks for your reply.

Finally with the fax manual I was able to disable the Super G3 function (V.34) and then it worked fine.

I will try your configuration once I really need the Super G3 speed.

Regards

Stefan

New Member

Re: Super G3 to Super G3 FAX from FXS to BRI

My understanding is that SG3 is not supported under fax-relay/T38 only under passthrough. As SG3 uses special tones standard fax pass-through doesn't recognise the setup so you need modem passthrough. I hope that this helps. There is a very good fax book produced by Cisco Press - do you have Safari?

New Member

Re: Super G3 to Super G3 FAX from FXS to BRI

Hi Joe

Unfortunately we don't have Safari yet. Thanks for your post, the post from Paul already had a config for modem-passthrough.

Actually I was looking for "SG3 to G3 fall-back" which didn't really worked in my setup. Finally I was able to reconfigure the fax machine to G3.

Kind Regards

Stefan

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