Disconnection

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Jun 8th, 2009
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We are Having E1 line connected to UC 500.



Whenever a user tries to call someone and the called party sends a BUSY tone , the disconnection Time  takes 5 to 10 sec, i have modified voice port to disconnect within 0 secs but still the issue is not resolved.



Debug shows the call is Disconnected , But the phone still rings up to 10 secs



Please post your valuable suggestions  regarding this issue.

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Steven Smith Mon, 06/08/2009 - 14:05
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To make sure I understand the problem correctly...


User places a call.  User gets ringback.


Debugs show that the call is busy.  Call disconnects on the PRI side.


User phone still gets ringback for a few more seconds.


Is that correct?  Does the user ever get busy tone?  Is this an FXS phone?

suraj12345 Mon, 06/08/2009 - 14:10
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Yes Steven what you said is correct.



The phones we use are the following.



7941 -G , 7945G etc .




No phones are connected to FXS ports.

Steven Smith Tue, 06/09/2009 - 06:54
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Does the user ever get busy tone?  Does the call disappear from the phone before the busy tone?

suraj12345 Wed, 06/10/2009 - 00:20
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Yes, for example, caller A calls Caller B.



Caller B sends a busy Tone immediately , Caller A will get the Busy Tone from the B after 10 secs.



The disconnection time in voice port is set to 0. Still it takes Time.



Now Our Telco says that I can change the frequency and cadance, i have done it for FXO ports in one of our previous Installation  , is it possible to change this In E1.

Steven Smith Wed, 06/10/2009 - 07:32
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Frequency and cadence shouldn't matter on a PRI.  You get a message that says busy.  It isn't like an FXO where notifications are with tones.


Let me look into this a bit to see if I can find something.

David Trad Wed, 06/10/2009 - 22:43
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Hi Suraj,



Yes, for example, caller A calls Caller B.



Caller B sends a busy Tone immediately , Caller A will get the Busy Tone from the B after 10 secs.


WOW i havent seen this problem before on a PRI circuit.


Suraj, i dont suppose you have a full debug message of this taking place do you?


Can you post them to look at, it would be interesting to see this happening live to see what is taking place.




Cheers,




David.

Marcos Hernandez Thu, 06/11/2009 - 05:26
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I am with David. This is very weird. More information is needed here to determine exactly what's happening.


Thanks,

Marcos

suraj12345 Thu, 06/11/2009 - 08:53
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Hi all

Thanks for your valuable comments


  Check the debug output


Jun 11 19:16:02: ISDN Se0/3/0:15 Q931: Applying typeplan for sw-type 0x12 is 0x0 0x1, Calling num 098
Jun 11 19:16:02: ISDN Se0/3/0:15 Q931: Applying typeplan for sw-type 0x12 is 0x0 0x1, Called num 0507840168
Jun 11 19:16:02: ISDN Se0/3/0:15 Q921: User TX -> INFO sapi=0 tei=0, ns=116 nr=109
Jun 11 19:16:02: ISDN Se0/3/0:15 Q931: SETUP pd = 8  callref = 0x046E
    Sending Complete
    Bearer Capability i = 0x8090A3
        Standard = CCITT
        Transfer Capability = Speech 
        Transfer Mode = Circuit
        Transfer Rate = 64 kbit/s
    Channel ID i = 0xA9839F
        Exclusive, Channel 31
    Progress Ind i = 0x8183 - Origination address is non-ISDN 
    Calling Party Number i = 0x0180, '098'
        Plan:ISDN, Type:Unknown
    Called Party Number i = 0x81, '0507840168'
        Plan:ISDN, Type:Unknown
Jun 11 19:16:02: ISDN Se0/3/0:15 Q921: User RX <- RR sapi=0 tei=0 nr=117
Jun 11 19:16:02: ISDN Se0/3/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=109 nr=117
Jun 11 19:16:02: ISDN Se0/3/0:15 Q931: CALL_PROC pd = 8  callref = 0x846E
    Channel ID i = 0xA9839F
        Exclusive, Channel 31
Jun 11 19:16:02: ISDN Se0/3/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=110
Jun 11 19:16:05: ISDN Se0/3/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=110 nr=117
Jun 11 19:16:05: ISDN Se0/3/0:15 Q931: ALERTING pd = 8  callref = 0x846E
Jun 11 19:16:05: ISDN Se0/3/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=111
Jun 11 19:16:15: ISDN Se0/3/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=111 nr=117
Jun 11 19:16:15: ISDN Se0/3/0:15 Q931: DISCONNECT pd = 8  callref = 0x846E
    Cause i = 0x8091 - User busy
    Progress Ind i = 0x8288 - In-band info or appropriate now available
Jun 11 19:16:15: ISDN Se0/3/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=112
Jun 11 19:16:15: ISDN Se0/3/0:15 Q931: call_disc: PI received in disconnect; Postpone sending RELEASE for callid 0x83EF
Jun 11 19:16:25: ISDN Se0/3/0:15 Q921: User TX -> RRp sapi=0 tei=0 nr=112
Jun 11 19:16:25: ISDN Se0/3/0:15 Q921: User RX <- RRp sapi=0 tei=0 nr=117
Jun 11 19:16:25: ISDN Se0/3/0:15 Q921: User TX -> RRf sapi=0 tei=0 nr=112
Jun 11 19:16:25: ISDN Se0/3/0:15 Q921: User RX <- RRf sapi=0 tei=0 nr=117
Jun 11 19:16:35: ISDN Se0/3/0:15 Q921: User TX -> RRp sapi=0 tei=0 nr=112
Jun 11 19:16:35: ISDN Se0/3/0:15 Q921: User RX <- RRf sapi=0 tei=0 nr=117
Jun 11 19:16:45: ISDN Se0/3/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=112 nr=117
Jun 11 19:16:45: ISDN Se0/3/0:15 Q931: RELEASE pd = 8  callref = 0x846E
    Cause i = 0x8091 - User busy

Marcos Hernandez Thu, 06/11/2009 - 09:22
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I see what's happening now. This is for an outbound call. For some reason I thought you were talking about inbound. Anyway, you are getting a DISCONNECT with indication to play inband audio (Progress Indicator = 8"), so the ISDN T306 time is kicking in. You can tweak this under the D channel, or you can eliminate PI completely with some other commands. I'd rather tweak the timer. The D channel is your Serial 0/3/0:15 interface, and this timer should be listed under the "isdn timer" command.


From the documentation:

Usage Guidelines


The T306 timer is designed for routers that are configured as an ISDN network-side switch. When a router sends out a disconnect message with a progress indicator of 8, it disconnects the call after waiting for the specified number of milliseconds (ms) while the in-band announcement or error tone is playing. Be sure to set the timer long enough for the announcement to be heard or the tone to be recognized. This command is used only for disconnect messages with a progress indicator of 8; otherwise, the T305 timer is used. The default and no forms of this command have the same result: the timer waits for the default number of ms before disconnecting the call.




Let us know,


Marcos

suraj12345 Thu, 06/11/2009 - 10:55
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I have tried to reduce the time in  int serial 0/3/0:15.


ISDN T306 to 400 milliseconds


Disconnection timer remains the same takes 10 secs

Marcos Hernandez Thu, 06/11/2009 - 11:15
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Can you try this global command:


voice call disc-pi-off


Let me know,


Marcos

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