asterisk users - Jan 2005 - Help in E1-T1 encoding

I have an asterisk with a TE110P configured as T1 which is behind a PSTN
gateway. This gateway has an E1 to PSTN and a T1 to asterisk.  This T1 is
configured as Network and * as CPE.

Every call I receive in E1 gateway is directly switched to asterisk using
T1. Remember E1 is alaw. Both E1 and T1 have Natural Microsystems boards
with a very simple software.

When I call to E1 asterisk signalling works fine, receives the call, answers
it and playback a messaage. This message is reproduced with distortion like
when you have an encoding ulaw/alaw error. I tried to configure * T1 in alaw
configuring it in zaptel.conf but the same happens.

If instead of calling from E1 PSTN I use any SIP phone, the message is
normally reproduced without distortion. I could not connect * directly to a
T1 to test it because I do not have the possibilty to have installed one in
Argentina.

Any ideas?

Thanks in advance.


Alejandro G

On Mon, 10 Jan 2005, Alejandro G wrote:
> When I call to E1 asterisk signalling works fine, receives the call,
answers
> it and playback a messaage. This message is reproduced with distortion like
> when you have an encoding ulaw/alaw error. I tried to configure * T1 in
alaw
> configuring it in zaptel.conf but the same happens.
> 
> If instead of calling from E1 PSTN I use any SIP phone, the message is
> normally reproduced without distortion. I could not connect * directly to a
> T1 to test it because I do not have the possibilty to have installed one in
> Argentina.
What kinds of E1/T1 links are you on? Isdn or some other signalling? 

Peter

The call is received from the PSTN by an NMS E1 with ISDN Pri (EuroISDN) and
is switched to the NMS T1 using NMS MVIP internal bus switch that is similar
to a H.100 bus with few streams/timeslots.

Once in the T1 (which is running National ISDN 2 Pri) this board
"calls" the
TE110P in asterisk which is connected by a loopback cable. Asterisk receives
call, asnwer it and do the stuff planned in the dialplan. Both T1 boards
where first configured using ulaw and then alaw. In both cases the sound had
distortion.

Today I test another configuration trying to isolate error. Instead of using
a NMS T1, I used another NMS E1 and I configure TE110P as an E1 using in
both boards also EuroISDN and everything began to work fine. I also connect
the TE110P to a live E1 and again everything is Ok. I not sure that the
distortion is an encoding difference but it really seems that there is the
problem.

Configuration for T1 in zaptel.conf

span=1,0,0,esf,b8zs
bchan=1-23
dchan=24
alaw=1-23

I check with command in CLI zap show channel 1 the Default law indicates
alaw as expected. If I comment last line works the same but it indicates
ulaw.

zapata.conf:

callprogress=no
signalling=pri_cpe
switchtype=national
overlapdial=yes
usecallerid=yes
hidecallerid=no
immediate=no
echocancel=no
echocancelwhenbridged=no
callerid=asreceived
context=incoming-call
channel=1-23
language=es
rxgain=0.0
txgain=0.0

Sorry for so long mail and thanks.


Alejandro Ghergherian

Peter,

Should I do the with pri intense debug span or pri debug span only? 
I will need a little more time for install again the T1's.

Alejandro

Peter,

Sorry for the delay. I had to reconfigure all again. I do I inbound call to
asterisk and the result log is this (hope this is usefull):


Alejandro


Enabled EXTENSIVE debugging on span 1
*CLI> T203 counter expired, sending RR and scheduling T203 again
Sending Receiver Ready (27)
> [ 00 01 01 37 ]
> Supervisory frame:
> SAPI: 00  C/R: 0 EA: 0
>  TEI: 000        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 027 P/F: 1
> 0 bytes of data
-- Restarting T203 counter

< [ 00 01 01 37 ]

< Supervisory frame:
< SAPI: 00  C/R: 0 EA: 0
<  TEI: 000        EA: 1
< Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
< N(R): 027 P/F: 1
< 0 bytes of data
-- ACKing all packets from 26 to (but not including) 27
-- Since there was nothing left, stopping T200 counter
-- Stopping T203 counter since we got an ACK
-- Nothing left, starting T203 counter
-- Got RR response to our frame
-- Restarting T203 counter

< [ 02 01 36 36 08 02 05 00 05 04 03 80 90 a2 18 03 a9 83 81 6c 0c 00 80 31
31 34 37 38 35 33 38 37 37 70 0c 80 30 31 31 35 35 34 34 35 34 30 39 7d 02
91 81 ]

< Informational frame:
< SAPI: 00  C/R: 1 EA: 0
<  TEI: 000        EA: 1
< N(S): 027   0: 0
< N(R): 027   P: 0
< 47 bytes of data
-- ACKing all packets from 26 to (but not including) 27
-- Since there was nothing left, stopping T200 counter
-- Stopping T203 counter since we got an ACK
-- Nothing left, starting T203 counter
< Protocol Discriminator: Q.931 (8)  len=47
< Call Ref: len= 2 (reference 1280/0x500) (Originator)
< Message type: SETUP (5)
< [04 03 80 90 a2]
< Bearer Capability (len= 5) [ Ext: 1  Q.931 Std: 0  Info transfer
capability: Speech (0)
<                              Ext: 1  Trans mode/rate: 64kbps, circuit-mode
(16)
<                              Ext: 1  User information layer 1: u-Law (34)
< [18 03 a9 83 81]
< Channel ID (len= 5) [ Ext: 1  IntID: Implicit, PRI Spare: 0, Exclusive
Dchan: 0
<                        ChanSel: Reserved
<                       Ext: 1  Coding: 0   Number Specified   Channel Type:
3
<                       Ext: 1  Channel: 1 ]
< [6c 0c 00 80 31 31 34 37 38 35 33 38 37 37]
< Calling Number (len=14) [ Ext: 0  TON: Unknown Number Type (0)  NPI:
Unknown Number Plan (0)
<                           Presentation: Presentation permitted, user
number not screened (0) '1147853877' ]
< [70 0c 80 30 31 31 35 35 34 34 35 34 30 39]
< Called Number (len=14) [ Ext: 1  TON: Unknown Number Type (0)  NPI:
Unknown Number Plan (0) '01155335410' ]
< [7d 02 91 81]
< IE: High-layer Compatibility (len = 4)
Sending Receiver Ready (28)
> [ 02 01 01 38 ]
> Supervisory frame:
> SAPI: 00  C/R: 1 EA: 0
>  TEI: 000        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 028 P/F: 0
> 0 bytes of data
-- Restarting T203 counter
-- Restarting T203 counter
> [ 00 01 36 38 08 02 85 00 02 18 03 a9 83 81 ]
> Informational frame:
> SAPI: 00  C/R: 0 EA: 0
>  TEI: 000        EA: 1
> N(S): 027   0: 0
> N(R): 028   P: 0
> 10 bytes of data
-- Restarting T203 counter
Stopping T_203 timer
Starting T_200 timer
> Protocol Discriminator: Q.931 (8)  len=10
> Call Ref: len= 2 (reference 1280/0x500) (Terminator)
> Message type: CALL PROCEEDING (2)
> [18 03 a9 83 81]
> Channel ID (len= 5) [ Ext: 1  IntID: Implicit, PRI Spare: 0, Exclusive
Dchan: 0
>                        ChanSel: Reserved
>                       Ext: 1  Coding: 0   Number Specified   Channel Type:
3
>                       Ext: 1  Channel: 1 ]
    -- Accepting call from '1147853877' to '01155335410' on
channel 0/1,
span 1
    -- Executing Ringing("Zap/1-1", "") in new stack
> [ 00 01 38 38 08 02 85 00 01 1e 02 81 88 ]
> Informational frame:
> SAPI: 00  C/R: 0 EA: 0
>  TEI: 000        EA: 1
> N(S): 028   0: 0
> N(R): 028   P: 0
> 9 bytes of data
T_200 timer already going (2)
> Protocol Discriminator: Q.931 (8)  len=9
> Call Ref: len= 2 (reference 1280/0x500) (Terminator)
> Message type: ALERTING (1)
> [1e 02 81 88]
> Progress Indicator (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0) 0:
0   Location: Private network serving the local user (1)
>                               Ext: 1  Progress Description: Inband
information or appropriate pattern now available. (8) ]
    -- Executing Wait("Zap/1-1", "4") in new stack

< [ 00 01 01 38 ]

< Supervisory frame:
< SAPI: 00  C/R: 0 EA: 0
<  TEI: 000        EA: 1
< Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
< N(R): 028 P/F: 0
< 0 bytes of data
-- ACKing all packets from 26 to (but not including) 28
-- ACKing packet 27, new txqueue is 28 (-1 means empty)
-- Something left to transmit (28), restarting T200 counter

< [ 00 01 01 3a ]

< Supervisory frame:
< SAPI: 00  C/R: 0 EA: 0
<  TEI: 000        EA: 1
< Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
< N(R): 029 P/F: 0
< 0 bytes of data
-- ACKing all packets from 27 to (but not including) 29
-- ACKing packet 28, new txqueue is -1 (-1 means empty)
-- Since there was nothing left, stopping T200 counter
-- Nothing left, starting T203 counter
-- Restarting T203 counter
    -- Executing Goto("Zap/1-1", "callthrough|s|1") in new
stack
    -- Goto (callthrough,s,1)
    -- Executing SetVar("Zap/1-1", "NR=") in new stack
    -- Executing BackGround("Zap/1-1",
"/asterisk/prepaga/prepaid_011") in
new stack
> [ 00 01 3a 38 08 02 85 00 07 18 03 a9 83 81 1e 02 81 82 ]
> Informational frame:
> SAPI: 00  C/R: 0 EA: 0
>  TEI: 000        EA: 1
> N(S): 029   0: 0
> N(R): 028   P: 0
> 14 bytes of data
-- Restarting T203 counter
Stopping T_203 timer
Starting T_200 timer
> Protocol Discriminator: Q.931 (8)  len=14
> Call Ref: len= 2 (reference 1280/0x500) (Terminator)
> Message type: CONNECT (7)
> [18 03 a9 83 81]
> Channel ID (len= 5) [ Ext: 1  IntID: Implicit, PRI Spare: 0, Exclusive
Dchan: 0
>                        ChanSel: Reserved
>                       Ext: 1  Coding: 0   Number Specified   Channel Type:
3
>                       Ext: 1  Channel: 1 ]
> [1e 02 81 82]
> Progress Indicator (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0) 0:
0   Location: Private network serving the local user (1)
>                               Ext: 1  Progress Description: Called
equipment is non-ISDN. (2) ]
    -- Playing '/asterisk/prepaga/prepaid_011' (language 'en')

< [ 00 01 01 3c ]

< Supervisory frame:
< SAPI: 00  C/R: 0 EA: 0
<  TEI: 000        EA: 1
< Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
< N(R): 030 P/F: 0
< 0 bytes of data
-- ACKing all packets from 28 to (but not including) 30
-- ACKing packet 29, new txqueue is -1 (-1 means empty)
-- Since there was nothing left, stopping T200 counter
-- Nothing left, starting T203 counter
-- Restarting T203 counter

< [ 02 01 38 3c 08 02 05 00 0f ]

< Informational frame:
< SAPI: 00  C/R: 1 EA: 0
<  TEI: 000        EA: 1
< N(S): 028   0: 0
< N(R): 030   P: 0
< 5 bytes of data
-- ACKing all packets from 29 to (but not including) 30
-- Since there was nothing left, stopping T200 counter
-- Stopping T203 counter since we got an ACK
-- Nothing left, starting T203 counter
< Protocol Discriminator: Q.931 (8)  len=5
< Call Ref: len= 2 (reference 1280/0x500) (Originator)
< Message type: CONNECT ACKNOWLEDGE (15)
Sending Receiver Ready (29)
> [ 02 01 01 3a ]
> Supervisory frame:
> SAPI: 00  C/R: 1 EA: 0
>  TEI: 000        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 029 P/F: 0
> 0 bytes of data
-- Restarting T203 counter
-- Restarting T203 counter
T203 counter expired, sending RR and scheduling T203 again
Sending Receiver Ready (29)
> [ 00 01 01 3b ]
> Supervisory frame:
> SAPI: 00  C/R: 0 EA: 0
>  TEI: 000        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 029 P/F: 1
> 0 bytes of data
-- Restarting T203 counter

< [ 00 01 01 3d ]

< Supervisory frame:
< SAPI: 00  C/R: 0 EA: 0
<  TEI: 000        EA: 1
< Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
< N(R): 030 P/F: 1
< 0 bytes of data
-- ACKing all packets from 29 to (but not including) 30
-- Since there was nothing left, stopping T200 counter
-- Stopping T203 counter since we got an ACK
-- Nothing left, starting T203 counter
-- Got RR response to our frame
-- Restarting T203 counter
    -- Executing ResponseTimeout("Zap/1-1", "10") in new
stack
    -- Set Response Timeout to 10
    -- Executing WaitExten("Zap/1-1", "") in new stack
T203 counter expired, sending RR and scheduling T203 again
Sending Receiver Ready (29)
> [ 00 01 01 3b ]
> Supervisory frame:
> SAPI: 00  C/R: 0 EA: 0
>  TEI: 000        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 029 P/F: 1
> 0 bytes of data
-- Restarting T203 counter

< [ 00 01 01 3d ]

< Supervisory frame:
< SAPI: 00  C/R: 0 EA: 0
<  TEI: 000        EA: 1
< Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
< N(R): 030 P/F: 1
< 0 bytes of data
-- ACKing all packets from 29 to (but not including) 30
-- Since there was nothing left, stopping T200 counter
-- Stopping T203 counter since we got an ACK
-- Nothing left, starting T203 counter
-- Got RR response to our frame
-- Restarting T203 counter

< [ 02 01 3a 3c 08 02 05 00 45 08 02 82 90 ]

< Informational frame:
< SAPI: 00  C/R: 1 EA: 0
<  TEI: 000        EA: 1
< N(S): 029   0: 0
< N(R): 030   P: 0
< 9 bytes of data
-- ACKing all packets from 29 to (but not including) 30
-- Since there was nothing left, stopping T200 counter
-- Stopping T203 counter since we got an ACK
-- Nothing left, starting T203 counter
< Protocol Discriminator: Q.931 (8)  len=9
< Call Ref: len= 2 (reference 1280/0x500) (Originator)
< Message type: DISCONNECT (69)
< [08 02 82 90]
< Cause (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0) 0: 0   Location:
Public network serving the local user (2)
<                  Ext: 1  Cause: Normal Clearing (16), class = Normal Event
(1) ]
Sending Receiver Ready (30)
> [ 02 01 01 3c ]
> Supervisory frame:
> SAPI: 00  C/R: 1 EA: 0
>  TEI: 000        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 030 P/F: 0
> 0 bytes of data
-- Restarting T203 counter
-- Restarting T203 counter
    -- Channel 0/1, span 1 got hangup
  == Spawn extension (callthrough, s, 4) exited non-zero on 'Zap/1-1'
> [ 00 01 3c 3c 08 02 85 00 4d 08 02 81 90 ]
> Informational frame:
> SAPI: 00  C/R: 0 EA: 0
>  TEI: 000        EA: 1
> N(S): 030   0: 0
> N(R): 030   P: 0
> 9 bytes of data
-- Restarting T203 counter
Stopping T_203 timer
Starting T_200 timer
> Protocol Discriminator: Q.931 (8)  len=9
> Call Ref: len= 2 (reference 1280/0x500) (Terminator)
> Message type: RELEASE (77)
> [08 02 81 90]
> Cause (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0) 0: 0   Location:
Private network serving the local user (1)
>                  Ext: 1  Cause: Normal Clearing (16), class = Normal Event
(1) ]
    -- Hungup 'Zap/1-1'

< [ 00 01 01 3e ]

< Supervisory frame:
< SAPI: 00  C/R: 0 EA: 0
<  TEI: 000        EA: 1
< Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
< N(R): 031 P/F: 0
< 0 bytes of data
-- ACKing all packets from 29 to (but not including) 31
-- ACKing packet 30, new txqueue is -1 (-1 means empty)
-- Since there was nothing left, stopping T200 counter
-- Nothing left, starting T203 counter
-- Restarting T203 counter

< [ 02 01 3c 3e 08 02 05 00 5a ]

< Informational frame:
< SAPI: 00  C/R: 1 EA: 0
<  TEI: 000        EA: 1
< N(S): 030   0: 0
< N(R): 031   P: 0
< 5 bytes of data
-- ACKing all packets from 30 to (but not including) 31
-- Since there was nothing left, stopping T200 counter
-- Stopping T203 counter since we got an ACK
-- Nothing left, starting T203 counter
< Protocol Discriminator: Q.931 (8)  len=5
< Call Ref: len= 2 (reference 1280/0x500) (Originator)
< Message type: RELEASE COMPLETE (90)
Sending Receiver Ready (31)
> [ 02 01 01 3e ]
> Supervisory frame:
> SAPI: 00  C/R: 1 EA: 0
>  TEI: 000        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 031 P/F: 0
> 0 bytes of data
-- Restarting T203 counter

-- Restarting T203 counter

On Fri, 14 Jan 2005, Alejandro G wrote:
> Sorry for the delay. I had to reconfigure all again. I do I inbound call to
> asterisk and the result log is this (hope this is usefull):
> < Protocol Discriminator: Q.931 (8)  len=47
> < Call Ref: len= 2 (reference 1280/0x500) (Originator)
> < Message type: SETUP (5)
> < [04 03 80 90 a2]
> < Bearer Capability (len= 5) [ Ext: 1  Q.931 Std: 0  Info transfer
> capability: Speech (0)
> <                              Ext: 1  Trans mode/rate: 64kbps,
circuit-mode
> (16)
> <                              Ext: 1  User information layer 1: u-Law
(34)
> < [18 03 a9 83 81]
Ok, the incoming call is signalled as being u-Law from the originating
device to Asterisk. Can you describe the set up (E1/T1, expected codecs on
the various legs) for this call? Also, sum up the problem again.

Peter