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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 04/07/13 21:39, Gordon Henderson wrote: > On Thu, 4 Jul 2013, Mark Evans wrote: > > >>> I've tried adjusting the txgain in chan_dahdi.conf and it >>> doesn't seem to make much if any difference (I've also >>> restarted dahdi and Asterisk after making the changes). It's >>> currently set at txgain = 22.0 (I wasn't sure how high to put >>> it to). >> >> You could try a Zycoo ZX20-A202. Which is an ARM based Asterisk >> box with two FXO ports built in. (Around £140). > > They all use the same modules - or the same reference design for > the analog side of things. The issue here is that the incoming > line is long, so the voice volume is low - the hardware can amplify > it a bit, but not by much. More that if Rob was going to want to try changing the hardware the whole box is rather cheaper than a Diginum TDM or AEX card > >> How long an extension cable? Might be better to run CW1308, even >> CAT5, t a secondary socket. Keeping the flex to under 2m. > > A few meters of bell wire won't make any difference to a few miles > of copper already there, as far as the audio is concerned. A bit odd that the problem is only showing on one line. Unless they happen to take entirely different routes from the exchange. Even if this isn't the case and the problem is obvious using a phone plugged into the "test socket". It can still be a struggle getting BT to consider swapping pairs over or checking cable joints. (Might be even more of an issue now that BT have split into "Openreach" and "BT Retail".) > I've been there many times. Sometimes I can tweak the gains and > make it better, sometimes not. If the internet line is stable (on > another copper pair) then I just port the numbers into my platform > and be done with it. It's even possible for ADSL to work well on a line which is marginal for voice. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iEYEARECAAYFAlHV52AACgkQsoRLMhsZpFcKAgCeKp+s0ORyUTQ4ICa7M3itBCGv 724An0xWz0CMeSWSvDz20+uuiwHSVlhf =Qte0 -----END PGP SIGNATURE----- -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq