[asterisk-users] asterisk-users Digest, Vol 95, Issue 6

[Ahmed Munir]

I figured out the problem. Actually the sending fax machine speed was set
as 33000 bps, later I set to 14400 bps and in my dial plan, I forcefully
set to use T.38 protocol. After that I was able to receive fax.

Thanks Tim for assisting me out :).


> ----- Original Message -----
>
> > 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
>
>
> T.38 failed to negotiate. That means either your Asterisk side, or your
> Cisco side are not playing nicely together. A packet capture of the call
> setup would be helpful to determine which side is having the issues.
>
> --Tim
>
> --
Regards,

Ahmed Munir Chohan
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