T.38 Faxing Outbound via a Gateway to make call routing decisions

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Apr 25th, 2008
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I am trying to get my fax solution to work outbound. Long Story short my fax server cannot route via calling number, they can only route based on called number. So I have devised a workaround to send all calls to a dedicated router that will route based on calling number and then route to the appropriate Gateway. It Routes properly because I can use a cisco phone and complete a call but faxing attempts attempts to sync up using T.38 but I am receiving a sip message - 488 Not Acceptable Media.


I have tried both H323 and SIP as well as playing with the Fax Rate, sip udp, etc…. but still having an issue.


For Testing Purposes I have the following setup.

FaxServer ->Gateway1->Gateway2->PSTN




Gateway1 ver12.4(17a)


voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip

fax protocol t38 ls-redundancy 2 hs-redundancy 2 fallback cisco

h323

sip

bind control source-interface FastEthernet0/1

bind media source-interface FastEthernet0/1


!

voice class h323 1

h225 timeout tcp establish 3

!

voice translation-rule 1

rule 1 /\(.*\)/ /701\1/

!

voice translation-profile XXXXXXXXXX-In

translate called 1


dial-peer voice 1341 voip

description ***Outbound Fax Dial based on ANI 1341 Prepend 701 send to Dial

translation-profile incoming XXXXXXXXXX -In

answer-address XXXXXXXXXX

voice-class h323 1

session protocol sipv2

incoming called-number XXXXXXXXXX

dtmf-relay h245-alphanumeric

codec g711ulaw

fax-relay ecm disable

fax rate 14400

fax protocol t38 ls-redundancy 2 hs-redundancy 2 fallback cisco

no vad

!

dial-peer voice 7011341 voip

description ***Outbound Fax Dial Hairping

destination-pattern 701T

voice-class h323 1

session protocol sipv2

session target ipv4:<Gateway2IpAddress>

dtmf-relay h245-alphanumeric

codec g711ulaw

fax-relay ecm disable

fax rate 14400

fax protocol t38 ls-redundancy 2 hs-redundancy 2 fallback cisco

no vad

!




Gateway2 12.4(15)T3


12.4(15)T3


voice service voip

address-hiding

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip

fax protocol t38 ls-redundancy 2 hs-redundancy 2 fallback cisco

h323

sip

bind control source-interface GigabitEthernet0/0

bind media source-interface GigabitEthernet0/0

options-ping 90


voice class h323 1

h225 timeout tcp establish 3


dial-peer voice 999998 pots

destination-pattern 7010T

port 0/1/0:23


dial-peer voice 2 voip

description ***default inbound voip dial peer ****

voice-class h323 1

session protocol sipv2

incoming called-number .

dtmf-relay h245-alphanumeric

codec g711ulaw

fax-relay ecm disable

fax rate 14400

fax protocol t38 ls-redundancy 2 hs-redundancy 2 fallback cisco


Anyone have any ideas?


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shane.orr Fri, 04/25/2008 - 14:10
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Nevermind I figured it out, we upgraded the one router to 12.4(15)T3 IPVoice


I think it has some additional commands like the default "fax-relay sg3-to-g3"


Then it started working...after that we wanted calls to go through call manager and in order to get T.38 going there we had to change the sip security profile to UDP on outgoing Transport Type.

stuart.pannell Thu, 09/11/2008 - 14:05
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Which did you find easier Sip or H323, what fax server are you using? could you please let me see your current config.


Thank you

Stuart

shane.orr Thu, 09/11/2008 - 18:00
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I have done several installations in the past couple of months. Each instance has been slightly different and many times Call Manager is in the equations so it gets a bit more complicated but if I was setting up the Fax Software to communicate directly to the PSTN Gateway I suppose I would choose H323 and the configurations does not changed much from above.


I use Xmedius Fax Software made by Sagem Interstar. I like Xmedius alot especially now that you can either install it on a traditional server, or it can now be installed on a Network Module on a Router.


Sorry, I know that did not help you much.

stuart.pannell Wed, 09/24/2008 - 07:14
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Thank you very much, I have worked out what the problem was and managed to get h323 to work, it was the ISDN dialling national all the time, must be due to the FAX server forcing it too as calls using CSIM Start were fine. I am now using ISDN maps on the ISDN interface.

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