[asterisk-users] Fax over IP?

[Ahmed Munir]

Hi Tim,

I'm using Asterisk 10 and on Cisco GW the protocol is set for FAX is T.38
and when I try to send the fax from a fax machine i.e. HP 3180, I'm getting
some warnings as listed below;

    -- Executing [4112345678 at default:1] Goto("SIP/192.168.1.69-00000005",
"fax-detect,fax,1") in new stack
    -- Goto (fax-detect,fax,1)
    -- Executing [fax at fax-detect:1] NoOp("SIP/192.168.1.69-00000005", "****
FAX DETECTED ****") in new stack
    -- Executing [fax at fax-detect:2] Goto("SIP/192.168.1.69-00000005",
"fax-receive,receive,1") in new stack
    -- Goto (fax-receive,receive,1)
    -- Executing [receive at fax-receive:1] NoOp("SIP/192.168.1.69-00000005",
"**** FAX RECEIVE ****") in new stack
    -- Executing [receive at fax-receive:2] Set("SIP/192.168.1.69-00000005",
"GLOBAL(FAXCOUNT)=5") in new stack
  == Setting global variable 'FAXCOUNT' to '5'
    -- Executing [receive at fax-receive:3] Set("SIP/192.168.1.69-00000005",
"FAXCOUNT=5") in new stack
    -- Executing [receive at fax-receive:4] Set("SIP/192.168.1.69-00000005",
"FAXFILE=fax-5-rx.tif") in new stack
    -- Executing [receive at fax-receive:5] Set("SIP/192.168.1.69-00000005",
"GLOBAL(LASTFAXCALLERNUM)=6461234567") in new stack
  == Setting global variable 'LASTFAXCALLERNUM' to '6461234567'
    -- Executing [receive at fax-receive:6] Set("SIP/192.168.1.69-00000005",
"GLOBAL(LASTFAXCALLERNAME)=") in new stack
  == Setting global variable 'LASTFAXCALLERNAME' to ''
    -- Executing [receive at fax-receive:7] NoOp("SIP/192.168.1.69-00000005",
"**** SETTING FAXOPT ****") in new stack
    -- Executing [receive at fax-receive:8] Set("SIP/192.168.1.69-00000005",
"FAXOPT(ecm)=yes") in new stack
    -- Executing [receive at fax-receive:9] Set("SIP/192.168.1.69-00000005",
"FAXOPT(headerinfo)=MY FAXBACK RX") in new stack
    -- Executing [receive at fax-receive:10] Set("SIP/192.168.1.69-00000005",
"FAXOPT(localstationid)=1234567890") in new stack
    -- Executing [receive at fax-receive:11] Set("SIP/192.168.1.69-00000005",
"FAXOPT(maxrate)=14400") in new stack
    -- Executing [receive at fax-receive:12] Set("SIP/192.168.1.69-00000005",
"FAXOPT(minrate)=2400") in new stack
    -- Executing [receive at fax-receive:13] NoOp("SIP/192.168.1.69-00000005",
"FAXOPT(ecm) : yes") in new stack
    -- Executing [receive at fax-receive:14] NoOp("SIP/192.168.1.69-00000005",
"FAXOPT(headerinfo) : MY FAXBACK RX") in new stack
    -- Executing [receive at fax-receive:15] NoOp("SIP/192.168.1.69-00000005",
"FAXOPT(localstationid) : 1234567890") in new stack
    -- Executing [receive at fax-receive:16] NoOp("SIP/192.168.1.69-00000005",
"FAXOPT(maxrate) : 14400") in new stack
    -- Executing [receive at fax-receive:17] NoOp("SIP/192.168.1.69-00000005",
"FAXOPT(minrate) : 2400") in new stack
    -- Executing [receive at fax-receive:18] NoOp("SIP/192.168.1.69-00000005",
"**** RECEIVING FAX : fax-5-rx.tif ****") in new stack
    -- Executing [receive at fax-receive:19]
ReceiveFAX("SIP/192.168.1.69-00000005",
"/var/spool/asterisk/fax/fax-5-rx.tif") in new stack
    -- Channel 'SIP/192.168.1.69-00000005' receiving FAX
'/var/spool/asterisk/fax/fax-5-rx.tif'
  == Using UDPTL CoS mark 5
[Jun  4 12:35:02] NOTICE[10371]: chan_sip.c:7577 sip_read: FAX CNG detected
but no fax extension
[Jun  4 12:35:02] WARNING[10072]: res_fax.c:1666 receivefax_t38_init:
channel 'SIP/192.168.1.69-00000005' refused to negotiate T.38
[Jun  4 12:35:02] WARNING[10072]: res_fax.c:1687 receivefax_t38_init: Audio
FAX not allowed on channel 'SIP/192.168.1.69-00000005' and T.38 negotiation
failed; aborting.
[Jun  4 12:35:02] ERROR[10072]: res_fax.c:1891 receivefax_exec: error
initializing channel 'SIP/192.168.1.69-00000005' in T.38 mode
  == Spawn extension (fax-receive, receive, 19) exited non-zero on
'SIP/192.168.1.69-00000005'

In my sip.conf global configuration I enabled 'fax detect' and
't38pt_udptl' and added Cisco VGW peer;

[CiscoVGW-10.70.X.X]
host=10.70.X.X
type=friend
disallow=all
allow=ulaw
allow=alaw
nat=yes
insecure=port,invite
context=fax-call
canreinvite=no
qualify=yes
dtmfmode=inband


While the fax machine starts to send the fax after a while it gives the
message, 'Fax failed' with error code: '388'. Is it the end point fax
machine issue or else? Please assist me out to resolve this issue at
earliest.


>
>
> > Thanks for your response. Here is my topology as listing down below;
>
> > PSTN Line --> Cisco Voice GW --> IP Cloud --> Asterisk
>
> > Will Asterisk able to receive the fax (as in topology above) using
> > its' fax module? In sip.conf I enabled fax detection and T.38.
> > Actually I don't want
> > to use Hylafax + iaxmodem as per requirement.
>
> If your Cisco voice gateway can deliver the calls using T.38, that should
> give you decent reliability. You'll want to us Asterisk 10 which has the
> best T.38 support at this point (compared to older releases). The receiving
> side of the equation then becomes whether to use Fax for Asterisk
> (commercial, 1 free channel, 2+ paid), or the included SpanDSP based fax
> module.
>
> --Tim
>
>
-- 
Regards,

Ahmed Munir Chohan
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