RE: [Asterisk-Users] CAS voice signalling?

[Jim Van Meggelen]

[EMAIL PROTECTED] wrote:
 According to CarrierAccess, the Adit 600 uses CAS for voice
 signalling. What is this? This should not be a problem for
 Asterisk? Does the Asterisk server need to reencode CAS into aLaw
 when going to Euro ISDN? 

Try this:

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a
00800e2560.shtml

Cheers,

Jim.

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Re: [Asterisk-Users] CAS voice signalling?

[Daniel Nyström]

Oh, thanks!
How do I know which codec is used on Adit 600?
Does the server need to reencode it at all, or is the codec the same on Euro 
ISDN?
If it has to reencode everything, it really seems to be CPU critical when using 
30 FSX lines into 30 Euro ISDN lines.

Btw, when using Adit for connecting 30 handsets. Is it FXS or FXO modules I 
need? As I've seen, there is alot of misunderstanding in that particulary case.

BR
Daniel Nyström

- Original Message - 
From: Steven Critchfield [EMAIL PROTECTED]
To: Asterisk Users Mailing List - Non-Commercial Discussion 
asterisk-users@lists.digium.com
Sent: Monday, January 17, 2005 2:57 PM
Subject: Re: [Asterisk-Users] CAS voice signalling?


 On Mon, 2005-01-17 at 14:33 +0100, Daniel Nyström wrote:
  According to CarrierAccess, the Adit 600 uses CAS for voice signalling. 
  What is this?
  This should not be a problem for Asterisk?
  Does the Asterisk server need to reencode CAS into aLaw when going to Euro 
  ISDN?
 
 CAS is Channel Associated Signaling. It isn't dependent on alaw or ulaw
 it has to do with where the signaling bits are. 
 
 Adit 600's are well known to work with asterisk. 
 -- 
 Steven Critchfield [EMAIL PROTECTED]
 
 

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Re: [Asterisk-Users] CAS voice signalling?

[Steven Critchfield]

On Mon, 2005-01-17 at 16:53 +0100, Daniel Nyström wrote:
 Oh, thanks!
 How do I know which codec is used on Adit 600?

Oddly enough, I don't see any options in the Adit 600 manual for setting
the codec for the normal FXS cards, but for the FXS5G card it has
varying impedance settings. 

From page 5-154 in the Adit 600 Release 3.2 manual
Index 1, 120 ohms + (.110uf || 820 ohms) A-law Norway.
Index 6, 220 ohms + (.115uf || 820 ohms) A-law Austria, Germany, Mexico,
Switzerland.
Index 8, 270 ohms + (.120uf || 910 ohms) A-law Finland


There are 19 listings, but only 3 of which are ulaw (Japan, Korea,
US/Taiwan).

 Does the server need to reencode it at all, or is the codec the same
 on Euro ISDN?
 If it has to reencode everything, it really seems to be CPU critical
 when using 30 FSX lines into 30 Euro ISDN lines.

From ulaw to Alaw shouldn't be compute intensive, it shouldn't be more
than a bit munge. It isn't like there is any compression involved.

 Btw, when using Adit for connecting 30 handsets. Is it FXS or FXO
 modules I need? As I've seen, there is alot of misunderstanding in
 that particulary case.

FXS is for pointing at a station(phone)
FXO is for pointing at a office(telco)

For phones attached directly, you need FXS ports.


 - Original Message - 
 From: Steven Critchfield [EMAIL PROTECTED]
 To: Asterisk Users Mailing List - Non-Commercial Discussion 
 asterisk-users@lists.digium.com
 Sent: Monday, January 17, 2005 2:57 PM
 Subject: Re: [Asterisk-Users] CAS voice signalling?
 
 
  On Mon, 2005-01-17 at 14:33 +0100, Daniel Nyström wrote:
   According to CarrierAccess, the Adit 600 uses CAS for voice signalling. 
   What is this?
   This should not be a problem for Asterisk?
   Does the Asterisk server need to reencode CAS into aLaw when going to 
   Euro ISDN?
  
  CAS is Channel Associated Signaling. It isn't dependent on alaw or ulaw
  it has to do with where the signaling bits are. 
  
  Adit 600's are well known to work with asterisk. 
  -- 
  Steven Critchfield [EMAIL PROTECTED]
  
-- 
Steven Critchfield [EMAIL PROTECTED]

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