On Sat, 29 Mar 2008, Steve Underwood wrote: > A lot of people seem to have trouble with mISDN and CAPI on various > machines, both with Asterisk and Callweaver. ISDN on Linux is a mess. It > could be the signal is stuttering at times, causing your DTMF detection > issues. However, the small amount of audio from the ISDN channel logged > as RTP packets in your files looks OK. > > The receiving FAX looks fine until the point where things switch into > T.38 mode. From then on nothing is received from the Callweaver box, > except a final SIP disconnect when the PSTN call drops. Looking at the > Callweaver log, it seems the T.38 data is correctly received and by > T38Gateway(), and forwarded as audio to the FAX machine. However, it > looks like nothing is received from the FAX machine. The fragment of > audio sent as RTP before the T.38 changeover looks OK, though. I wonder > if there is some issue between T38Gateway() and the CAPI channel driver? > > The sending case looks stranger. No RTP or UDPTL is sent by the > Callweaver box at all. The initial negotiation goes OK, but the CAPI > channel seems to immediately foul up with endless repeating of: > > ERROR[3059407792] chan_capi.c: Could not write to pipe for ISDN1#02 > > Maybe we have chan_capi problems here, rather than T.38 gateway ones. > Are there any other chan_capi user who can comment?
But voice call is ok. I can make call from SIP phone to CAPI ISDN and it seems to be ok. When I pick up fax call on voice phone I hear silent noise for some 15 seconds. Then absolute silence with very short silent noise intervals at random times. This lasts for another approx. 15 seconds. Call ends after 31 seconds from beginning. Strange. Damjan mentioned that fax sound seems to be soft. There is relative long analog cable between ATA and fax machine - some 20 meters. But through the same cable and same ATA faxes passes even in voice mode using asterisk (however, not 100% reliable) so I don't think signal going from ATA to callweaver can be significantly degraded. Regards Marek _______________________________________________ Callweaver-users mailing list [email protected] http://lists.callweaver.org/mailman/listinfo/callweaver-users
