On 02/03/2010 03:14 AM, Kevin P. Fleming wrote: > Steve Underwood wrote: > > >> I wonder why Asterisk would say: >> >> X-asterisk-Info: SIP re-invite (External RTP bridge) >> Content-Type: application/sdp >> Content-Length: 344 >> >> v=0 >> o=root 44350963 44350964 IN IP4 10.153.66.146 >> s=Asterisk PBX 1.6.1.13 >> c=IN IP4 10.153.66.146 >> t=0 0 >> m=image 4819 udptl t38 >> a=T38FaxVersion:0 >> a=T38MaxBitRate:14400 >> a=T38FaxFillBitRemoval >> a=T38FaxTranscodingMMR >> a=T38FaxTranscodingJBIG >> a=T38FaxRateManagement:transferredTCF >> a=T38FaxMaxDatagram:1400 >> a=T38FaxUdpEC:t38UDPRedundancy >> >> I'm pretty sure it doesn't support T38FaxTranscodingMMR or >> T38FaxTranscodingJBIG, so they should not be there. Perhaps more >> relevant to you, though, is why is * saying "(External RTP bridge)". >> Does it really mean it? >> > That latter part is just a small bug in chan_sip; any re-INVITE sent on > a call gets that tag, because originally direct media path (external > bridging) was the only means to generate re-INVITE requests. Now that > T.38 can do it as well, the code hasn't been changed to properly tag them. > > As far as the T.38 parameters go, those are under control of the > application that caused the re-INVITE (or the bridged channel, if this > is a passthrough situation). If he's using app_fax/spandsp, I believe we > currently have app_fax configured to offer TranscodingMMR and > TranscodingJBIG because spandsp supports those modes. The Fax for > Asterisk product does not, so re-INVITEs generated by that > implementation would not include those options. > Spandsp doesn't support those features. I don't know anything which does. It seems they can only be used with TCP. Spandsp does support
T38FaxFillBitRemoval which the FAX for Asterisk package does not (according to Commetrex). Steve -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
