Re: LCR1.14-MISDNV2-Asterisk11-No DialTone?

Gianni Veloce <gianniveloce-/[email protected]> Sat, 25 Oct 2014 07:29:49 -0700

Newsgroups	gmane.linux.isdn.i4l.user
Message-ID	<[email protected]>

Dear Arnold (and all)
Your setup contributed to HEARING a dialtone on my setup!!!
Only done this:

As being on Freepbx I used your context to populate the extensions_custom.conf file redirecting to [from-internal] context.
Seems working with a few tests.Very happy.

My next "project" is to use chan_lcr to connect the external ISDN line (NT box) to use it as an AsteriskTrunk.
Will again use a second ISDN USB adapter for this.

Any hints for are welcome in the meantime.
As promised when fully done I will post here ALL the installation and setup instructions for having mISDN v2 (hfcsusb) working with Asterisk 11 and FreePBX on Kernel 3.10.
For sure will take some time as it is a part time hobby for me.
Many thanks again.
GV

On Tuesday, October 21, 2014 12:18 AM, Arnold Schulz <[email protected]> wrote:

Dear Gianni,

from looking at the code and experimenting:

Typically echo cancellation is used for an isdn channel directly connected to a phone. I recently tested it by inserting and removing kernel module mISDN_dsp_oslec.ko. There really is some improvement when a hands-free speakerphone (i.e. loadspeaker) is used. Well, though my current production box does not have echo cancellation, hand free phoning - on one side of the connection only - is still ok.

Older chan_lcr versions could activate the oslec echo canceller via lcr_config(eoslec). The activation source code still exists in chan_lcr.c, but it is disabled. The new way is to activate the canceller via "filter pipeline oslec" in file /etc/lcr/interface.

Asterisk application lcr_config is provided by chan_lcr.so and may be explored via Asterisk command "core show application lcr_config". lcr_config(D) makes the key presses on the phone available to the Read application in the dialplan. Without this line, my Asterisk does not recognize dialing (I guess DTMF) during the Read application.

I whish you success,
cheers,

Arnold

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