From: John Novack <[EMAIL PROTECTED]>
[EMAIL PROTECTED] wrote:
This is rather bizarre: My TDM11 (one FXS) rings a $10 passive phone with
REN of 1.0B, a cheap speaker phone of 0.3B, and a cordless phone with
marked REN of 0.0B. But it couldn't properly ring this 27935GE3-B (FCC ID
G9H2-7930) cordless phone rated at merely 0.1B. Rarely, the phone will
crack out an occasional weak and abrupt beap, but never a normal ring.
Otherwise Asterisk and TDM400P works with this phone, dialing, voice,
callerID and all that. (In fact, when the FXS "rings", the display lights
up as it should.)
This is a dual-line 2.4 GHz cordless phone. It rings normally when
plugged into wall jack.
Any idea? Though not described in the manual specifications, Table B1
suggests that an FXS module (S110M?) supports at least REN 3.
Yuan Liu_______________________________________________
Have you tried toe boost ring voltage option then recompile Zaptel?
It is normally set to a fairly low voltage
John Novack
Thank you so much! I googled a bit about how to change ring voltage and
only found an old and suspended feature request from last year that
concerned wcfxs.c, which is now superceded by wctdm.c. Yet the same method
applies. So I changed the value of RING_X from 0x0160 to 0x023A as
suggested for European countries (peak of 85V according to that document)
but left frequency (RING_OSC) unchanged, like the following:
--- wctdm.c.1.2.10 2006-07-07 11:02:39.000000000 -0700
+++ wctdm.c 2006-12-13 22:04:28.862053256 -0800
@@ -81,7 +81,8 @@
{18,5,"OSC2Y",0x0000},
{19,6,"RING_V_OFF",0x0000},
{20,7,"RING_OSC",0x7EF0},
-{21,8,"RING_X",0x0160},
+// {21,8,"RING_X",0x0160},
+{21,8,"RING_X",0x023A}, // ring voltage set higher
{22,9,"RING_Y",0x0000},
{23,255,"PULSE_ENVEL",0x2000},
{24,255,"PULSE_X",0x2000},
Now the GM phone actually rings, though still a little strangely. Guess I
just have to experiment a little to completely address this - but that
feature request 0004542 should really be revived.
A configuration string "boostringer" was mentioned in several messages,
including one concerning TDM400P, all without indicating the applicable
configuration file. This has no apparent effect on TDM400P wherever I
tried.
BTW, I made some interesting tests - I'm relatively new to this, so bare
with my learning curve.
Without an oscilloscope, I used a DT-830B multimeter to test three "lines":
the Digium FXS, a Linksys WRTP54G FXS (yes, that's Vonage), and a PSTN land
line (SBC). This meter has a strange behaviour: it allows DC voltage to
pass through when in AC mode if polarity is favourable. Guess it's too
cheap to contain a decent capacitor. But this gives me an opportunity to
observe the difference between SLIC in a CO and one in a home appliance.
With Digium and Linksys, if I change polarity of the meter to allow DC
passthrough, idle AC would appear to be 108V, which drops to 60V during ring
phase; but with SBC, the apparent "AC" would appear boosted to 161V. Is
this because SLIC in a home appliance outputs square waves instead of sine
waves?
Linksys' AC output (without DC passthrough) measures about 61V, about the
same as SBC, while Digium's measured about 45V. Now Digium also measures
about 61V, but there's still some strangeness. Maybe an oscilloscope is
really needed:-(
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