[asterisk-users] Dahdi+Redfone+Channel Bank+E&M

[Jorge Mendoza]

Thank you Mitul for your answer. 
Yes, we have tested e&m before and it works. But I don't know why. That is what I don't understand. You said that E&M signalling does not have separate signalling channel, that is true for the T1 but not for E1. My understanding is that E1 CAS pass the E&M information in the bits abcd of channel 16, the signalling channel. 
Regards 
-- 
Jorge Mendoza 

----- Original Message -----

From: "Mitul Limbani" <mitul at enterux.in> 
To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users at lists.digium.com> 
Sent: Wednesday, 25 July, 2012 8:15:25 PM 
Subject: Re: [asterisk-users] Dahdi+Redfone+Channel Bank+E&M 


E&M signalling do not have seperate signalling channel. 
Configure as e&m=1-31 
Mitul 
On Jul 26, 2012 6:40 AM, "Jorge Mendoza" < jmendozat at tcc.com.pe > wrote: 


Hi, 

We are trying to connect an Asterisk server with a Channel Bank with E&M interfaces using a RedFone TDMoE device. 
The CB have a E1 CAS interface. 
OS: Ubuntu Server 11.10 64 bits 
dahdi: dahdi-linux-complete-2.6.1+2.6.1 

Redfone configuration: 
/etc/redfone.conf 

[span1] 
framing=cas 
encoding=hdb3 

System configuration: 
/etc/dahdi/system.conf 

dynamic=ethmf,eth0/00:50:c2:65:e0:64/0,31,1 
dynamic=ethmf,eth0/00:50:c2:65:e0:64/1,31,0 

e&me1=1-15,17-31 
dchan=16 

alaw=1-31 

loadzone = fr 
defaultzone = fr 

Error message: 
======================================================== 
# dahdi_cfg -vvvvv 

Changing signalling on channel 1 from Unused to E & M E1 
Changing law on channel 1 from Mu-law to A-law 
DAHDI_CHANCONFIG failed on channel 1: Invalid argument (22) 
Selected signaling not supported 
Possible causes: 
e&me1 signaling is being used on a T1 line (use e&m) 
RBS signaling is being used on a E1 CCS span 
Signaling is being assigned to channel 16 of an E1 CAS span 
========================================================= 

I don't understand the last possible cause mentioned: "Signaling is being assigned to channel 16 of an E1 CAS span", because the dchan is channel 16. 
Where is the error? 
Thank you. 
-- 
Jorge Mendoza 

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