[cisco-voip] Fax on FXS problem

Wed Jul 28 11:04:04 EDT 2010

I did not have enough time to go to customer site so I sent an engineer
to site and opened a TAC case and the TAC reply that it is a bug:

CSCtc98074    PVDM3 only 29/3900 must not initiate, or respond to, Cisco
Fax Relay 

<B>Symptom:</B>

A Cisco 2900 or 3900 series voice gateway, using only PVDM3 based DSPs,
will send, and respond to, requests to start Cisco Fax Relay. Cisco Fax
Relay is not supported on the PVDM3 hardware and calls that attempt to
use it will disconnect with "Cause Value = 172".

<B>Conditions:</B>

This happens on devices with only PVDM3 DSP resources.

<B>Workaround:</B>

Configure a fax handling method, fax relay T.38, fax pass-through, or
modem passthrough.

I will ask the TAC if they are going to solve it or it will be permanent
in the PVDM3 hardware.

 Best Regards;

  Ahmed Elnagar

  Senior Network PS Engineer

  Mob: +2019-0016211

  CCIE#24697 (Voice)

From: Ed Puzziferri [mailto:epuzziferri at factset.com] 
Sent: Wednesday, July 28, 2010 12:01 AM
To: Ahmed Elnagar
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Fax on FXS problem

Ahmed,

There is not a bug, this is how the 2900 operates with the new PVDM3's.
I opened a TAC SR and the engineer confirmed that fax relay was not
supported and I should disable it.  I found the configuration info by
looking it up myself.   If you search on the Cisco web site for
fax/modem relay you should find additional info.

Ed

From: Ahmed Elnagar [mailto:ahmed_elnagar at rayacorp.com] 
Sent: Tuesday, July 27, 2010 4:59 PM
To: Ed Puzziferri
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Fax on FXS problem

I will give it a try and give you a feedback...do you have a bug ID or
TAC number??

 Best Regards;

  Ahmed Elnagar

  Senior Network PS Engineer

  Mob: +2019-0016211

  CCIE#24697 (Voice)

From: Ed Puzziferri [mailto:epuzziferri at factset.com] 
Sent: Tuesday, July 27, 2010 7:38 PM
To: Ahmed Elnagar
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Fax on FXS problem

Are you using a 2900 router?  If so it does not support fax relay you
need to set if for modem relay.  I had the exact same error before I
changed the configuration.

voice service voip

modem relay nse codec g711u gw-controlled

modem relay nse codec g711a gw-controlled

You also need to disable fax relay on the ccm-manager config

no ccm-manager fax protocol

We are using mgcp gateway and I also added this (not sure if it's needed
for H323)

voice service voip

modem relay nse codec g711alaw gw-controlled

Once I set these commands my faxes worked fine.  I had a similar setup
fxs port going to telco PRI, all on the same router.

Ed

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Tuesday, July 27, 2010 12:06 PM
To: Scott Voll
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Fax on FXS problem

There are no VOIP legs involved in the call at all.

FAX machine>>>FXS port>>>PRI E1 "same router">>>>PSTN.

 Best Regards;

  Ahmed Elnagar

  Senior Network PS Engineer

  Mob: +2019-0016211

  CCIE#24697 (Voice)

From: Scott Voll [mailto:svoll.voip at gmail.com] 
Sent: Tuesday, July 27, 2010 6:34 PM
To: Ahmed Elnagar
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Fax on FXS problem

fax relay setup?

G729?

Scott

On Tue, Jul 27, 2010 at 7:26 AM, Ahmed Elnagar <
ahmed_elnagar at rayacorp.com> wrote:

Dear all;

I have a strange problem here:

I have a h323 voice gateway with FXS connected to a FAX machine and an
E1 PRI port to the Telco; when connecting analog phone to the port calls
are working normally "in and out" when connect a fax I can receive faxes
but not send...although I am able to send faxes to a remote site over
the WAN but cannot use the local E1 on the router to send faxes...below
is the error I got from the debug

013747: *Jul 27 11:38:22.813 UTC: ISDN Se0/0/0:15 Q931: Applying
typeplan for sw-type 0x12 is 0x0 0x1, Calling num 0238271333

013748: *Jul 27 11:38:22.813 UTC: ISDN Se0/0/0:15 Q931: Sending SETUP
callref = 0x021E callID = 0x81B0 switch = primary-net5 interface = User 

013749: *Jul 27 11:38:22.813 UTC: ISDN Se0/0/0:15 Q931: TX -> SETUP pd =
8  callref = 0x021E 

        Bearer Capability i = 0x8090A3 

                Standard = CCITT 

                Transfer Capability = Speech  

                Transfer Mode = Circuit 

                Transfer Rate = 64 kbit/s 

        Channel ID i = 0xA98382 

                Exclusive, Channel 2 

        Progress Ind i = 0x8183 - Origination address is non-ISDN  

        Calling Party Number i = 0x0180, '0238271333' 

                Plan:ISDN, Type:Unknown 

        Called Party Number i = 0x81, '38271499' 

                Plan:ISDN, Type:Unknown

013750: *Jul 27 11:38:22.849 UTC: ISDN Se0/0/0:15 Q931: RX <- SETUP_ACK
pd = 8  callref = 0x821E 

        Channel ID i = 0xA98382 

                Exclusive, Channel 2

013751: *Jul 27 11:38:23.005 UTC: ISDN Se0/0/0:15 Q931: RX <- CALL_PROC
pd = 8  callref = 0x821E

013752: *Jul 27 11:38:23.013 UTC: ISDN Se0/0/0:15 Q931: RX <- ALERTING
pd = 8  callref = 0x821E 

        Progress Ind i = 0x8488 - In-band info or appropriate now
available 

013753: *Jul 27 11:38:25.001 UTC: ISDN Se0/0/0:15 Q931: RX <- CONNECT pd
= 8  callref = 0x821E 

        Date/Time i = 0x0A071B0E26 

                Date (dd-mm-yr)   = 10-07-27 

                Time (hr:mnt:sec) = 14:38:224

013754: *Jul 27 11:38:25.001 UTC: %ISDN-6-CONNECT: Interface
Serial0/0/0:1 is now connected to 38271499 N/A

013755: *Jul 27 11:38:25.001 UTC: ISDN Se0/0/0:15 Q931: TX ->
CONNECT_ACK pd = 8  callref = 0x021E

013756: *Jul 27 11:38:32.065 UTC: %FLEXDSPRM-5-OUT_OF_RESOURCES: No dsps
found either locally or globally.

013757: *Jul 27 11:38:32.069 UTC: %ISDN-6-DISCONNECT: Interface
Serial0/0/0:1  disconnected from 38271499 , call lasted 7 seconds

013758: *Jul 27 11:38:32.069 UTC: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT
pd = 8  callref = 0x021E 

        Cause i = 0x80AC - Requested circuit/channel not available

013759: *Jul 27 11:38:32.125 UTC: ISDN Se0/0/0:15 Q931: RX <- RELEASE pd
= 8  callref = 0x821E

013760: *Jul 27 11:38:32.125 UTC: ISDN Se0/0/0:15 Q931: TX ->
RELEASE_COMP pd = 8  callref = 0x021E

  Best Regards;

  Ahmed Elnagar

  Senior Network PS Engineer

  RAYA Building El Motamiez District, 6th of October, Egypt 

  Mob: +2019-0016211

  Phone: +202 3827 6000 Ext.2475

  Website: www.rayacorp.com <http://www.rayacorp.com/> 

  E-mail: ahmed_elnagar at rayacorp.com

  CCIE#24697 (Voice)

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result of any malicious code or virus being passed on. Views expressed
in this communication are not necessarily those of Raya.If you have
received this message in error, please notify the sender immediately by
email, facsimile or telephone and return and/or destroy the original
message. 

Disclaimer: NOTICE The information contained in this message is confidential and is intended for the addressee(s) only. If you have received this message in error or there are any problems please notify the originator immediately. The unauthorized use, disclosure, copying or alteration of this message is strictly forbidden. Raya will not be liable for direct, special, indirect or consequential damages arising from alteration of the contents of this message by a third party or as a result of any malicious code or virus being passed on. Views expressed in this communication are not necessarily those of Raya.If you have received this message in error, please notify the sender immediately by email, facsimile or telephone and return and/or destroy the original message. 
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