[Asterisk-Users] FYI linejack card

[Gregg Lebovitz]

Hi,

I have been experimenting with Asterisk and the linejack card and have
discovered the follow:

1) The linejack in FXS mode works well with asterisk as long as the format
in the phone.conf is set to ulaw. With mode set to slinear, gsm recorded
messages played by voicemail appear to be slightly choppy (sounds like a click
at the end of each frame).

2) Using the configuration above, the linejack works well with the echo test.

3) Voicemail records smoothly and clearly as long as the format in voicemail.conf is set to
gsm. Using the settings of gsm|wav49|wav or even wav causes the recording to have
echo and be choppy.

I don't have time to figure out why this is the case.

Gregg

-----------------------------------

I am going to try this question once again. Does the lack of response imply
that everyone has abandoned LineJack cards for use with Asterisk?

I am trying to get a prototype working based on Asterisk and Quicknet
cards. I currently have to systems set up each with a LineJack card. I
have the systems working, but can't get the voicemail demo to work
properly. Messages to the user telephone set from the voicemail system
are clear, but recordings left through the phone are distorted. Sounds
like the audio has lots of echo and sampling error type distortion.

I know this must be covered in the archives, but I can't find a
reference.

I am using the Asterisk demo configurations. configuration is as
follows:

;
; Linux Telephony Interface
;
; Configuration file
;
[interfaces]

;mode=immediate
;mode=fxo
mode=dialtone

;format=g723.1
;format=slinear
format=ulaw

silencesupression=no
;
; List all devices we can use.  Contexts may also be specified
;
context=local
context=default

;
txgain=100%
rxgain=100%
device => /dev/phone0