[asterisk-users] Outbound fax issues

[Danny Nicholas]

What does your extensions.conf look like for this call?  If you can insert a
ww into your Dial command (ie, change 18005551212 to ww18005551212) this may
improve your dialing behavior.

 

  _____  

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Mikel Lindsaar
Sent: Sunday, December 21, 2008 3:21 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [asterisk-users] Outbound fax issues

 

Hello all.

 

I have the following setup:

 

Fax machine

    |

Sipura SPA-3120

    |

SIP 100BaseT

    |

Asterisk 1.4

    |

IAX2 100BaseT

    |

Asterisk 1.6

    |

ISDN PRI TE210P

    |

Traditional Telco

 

 

 

The fax lands on the Internal Asterisk 1.4 box, the sip config for this
extension looks like:

 

[35081]

type=friend

secret=************

qualify=yes

port=5060

nat=no

host=dynamic

dtmfmode=rfc2833

dial=SIP/35081

context=fax-line

canreinvite=no

callerid=device <35081>

disallow=all

allow=ulaw

allow=alaw

 

 

Now, inbound faxing (from the other side of the Telco to me) is working and
from what I can tell, never fails to receive.

 

Sending though is a bit touch and go.  Sometimes works, sometimes doesn't.
It's about a 40% success rate, and does not seem to depend on what number
dialed (ie, the problem has been basically isolated to my internal network).

 

The symptoms are long handshake times with the fax trying to get carrier,
then failing.  Redialing 2-6 times eventually gets the fax through.

 

The extensions.conf simply answers and dials out through the ISDN line.  No
special config here.

 

I believe from what I have read via our friends at Google and voip forums
around the place, that it is probably an echo or jitter problem, but what I
have found so far has been a bit vague.

 

Does anyone have any pointers on what I should be looking for to improve the
outbound call?

 

Thanks!

 

Mikel

 

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