[Spce-user] Fax issue

[Matthias Hohl]

Hello,

 

we also had this problem with Asterisk and 3CX… the problem was, that asterisk is not setting the right values for the t38 handshake 3CX requires. So it doesn’t work out of the box.

 

If you see the debugging log oft he 3cx you shoul see the problem:

 

    <RCV_ERROR>Call was either not from a fax machine, or else fax handshaking failed</RCV_ERROR>

 

09:57:22.143|2788|(0):FAXServer, 

Error reported thru T38__SET_CONFIG_CO (nai = 1)

09:57:22.143|2788|(0):FAXServer, 

   error source = (238) FOIP__START_ERR_SRC__T38_SESSION_CONFIG, Process: Session Configuration of T.38 entity (T38__SET_CONFIG_RQ (T38__SESSION_CNF))

09:57:22.143|2788|(0):FAXServer, 

   error code   = (111) T38__CFG_ERR_T38_CAP__2_FAX_MAX_BUFFER_SIZE, T38__cap__fax_max_buffer_size < T38__cap__max_datagram_size

 

 

The problem is, that Asterisk is not sending the MAX BUFFER SIZE so 3cx is setting there default value

 

Standardwerte der 3CX:

                   ushort fax_max_buffer_size; (10500)

                   ushort max_datagram_size;   (1500)

                   ushort fax_max_buffer_size; If missing (1024)

                   ushort max_datagram_size;   If missing (1024)

 

 

But MAX BUFFER SIZE must be bigger as MAX DATAGRAM otherwise faxing to 3CX does not working.

 

 

I hope i could help you a bit with your problem… 

 

 

Von: Spce-user [mailto:spce-user-bounces at lists.sipwise.com] Im Auftrag von William Hilsum
Gesendet: Freitag, 21. Oktober 2016 12:46
An: spce-user at lists.sipwise.com
Betreff: [Spce-user] Fax issue

 

Hi,

 

Got a little problem and I'm not too sure where the issue is.

 

I have a tenant on 3CX and I followed their guide for a fax, however when the call gets to 3CX, it instantly hangs up.

 

I've never used fax before on VOIP, and if it is an issue on 3CX, I apologise and will look there, but, I was wondering if anyone knows if there is anything special I need to do on Sipwise to support fax?

 

Thanks

 

William

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