18 May
2012
18 May
'12
10:24 a.m.
2012/5/16 Marcin Gozdalik <gozdal@gmail.com>
I'm trying to send fax from FreeSWITCH to PSTN using T.38. FS is connected to Broadsoft softswitch. The softswitch is connected to PSTN using SIP-trunk to external provider. Apparently there is no T.38 on Broadsoft and it is provided by the external provider (i.e. Broadsoft provides only T.38 pass-through).
[snip]
For anybody struggling with the same problem: it turned out to be loopback problem. It is possible to transmit a fax through loopback using txfax when the other side is issuing reINVITE. It is however not possible to force FS to issue reINVITE in txfax over loopback (using enable_t38_request). Best regards -- Marcin Gozdalik