Hello ,
I’am using spandsp in order to send and receive faxes , I’am also using Zoiper Softphone for that reason .
The problem is that I can recieve faxes , but when trying to send , this error messages apear :
ERROR[9616]: res_fax.c:1078 set_fax_t38_caps: channel ‘SIP/2234-00000000’ is in an unsupported T.38 negotiation state, cannot continue.
ERROR[9616]: res_fax.c:1078 set_fax_t38_caps: channel ‘SIP/2234-00000000’ is in an unsupported T.38 negotiation state, cannot continue.
My sip.conf file looks like this :
t38pt_udptl = yes
[1234]
callerid= “nameid” <1234> ; create a template for our devices
t38pt_udptl=yes
type=friend ; the channel driver will match on username first, IP second
context=FaxHosts ; this is where calls from the device will enter the dialplan
host=dynamic ; the device will register with asterisk
;nat=yes ; assume device is behind NAT
; *** NAT stands for Network Address Translation, which allows
; multiple internal devices to share an external IP address.
secret=***** ; a secure password for this device – DON’T USE THIS PASSWORD!
dtmfmode=auto ; accept touch-tones from the devices, negotiated automatically
disallow=all ; reset which voice codecs this device will accept or offer
allow=ulaw ; which audio codecs to accept from, and request to, the device
allow=alaw ; in the order we prefer
canreinvite=yes
(I tried with the option canreinvite=no but with no success 
)
Thank you for your help…