On Tue, Nov 25, 2003 at 05:51:37PM -0600, Don Pobanz wrote: > Modem connect speeds on calls through * seem to be lower than calls > made through the telephone company lines or our old Rolm PBX. All data > calls have 2 wire analog modems on both ends. > > For my set up I have channels of a Zhone channel bank tied to 2 modems. > The Zhone channel bank interfaces my * server with a T400P card. > modem --- Zhone Channel bank - * via T400P card - Zhone channel bank - > modem > > In extensions.conf I have added the 'd'ata option. > exten => 333,1, Dial(Zap/19,,d) > > In zapata.conf echo cancel has been turned off and I have experimented > with different size jitterbuffers, none of which seem to help. > > I couldn't find anything else in the archives. Other suggestions?
Could you be suffering from an extra digital <-> analog conversion? Each conversion between analog and digital hurts performance. (56k modems are faster than 33.6 modems because there is no digital <-> analog conversion on the ISP side.) I have PRI lines and just few days ago, I posted a reply to subject: "Echo Cancellation, TDMoE fails, X100P works" that includes a detailed explanation of my setup that runs v.90 modems at full speed through *. Gary > > Don Pobanz > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
