[asterisk-ss7] ss7-27-knk: Bringing MTP3 up ?

Tue Mar 26 05:30:59 CDT 2013

Hi!

just set the

mtp3_timer.t21 = 1 

Regards,
Attila

On Tue, 2013-03-26 at 11:28 +0100, Pavel Troller wrote:
> Hi!
>   I'm new in this list, I was "invited" by Kaloyan to post there in case
> of some questions or problems regarding the improved SS7 support in 
> chan_dahdi.
>   My first finding is, that now I can't bring MTP3 up. It seems, that the
> MTP3 layer now relies on receiving the TRA message to proceed with
> initialization. However, in our national SS7 network, these messages
> are not used. Sending successful SLTM/SLTA both ways is enough to
> initialize the linkset.
>   I'm trying to establish a direct linkset to EWSD (no STPs between). AFAIK,
> EWSD with Czech national SS7 doesn't send TRA messages and doesn't require
> their receipt. I know EWSD reasonably well and I don't know any method, how
> to force it to send TRAs.
>   EWSD sees the linkset as up and tries to send GRS on ISUP, which is
> refused by Asterisk, because its MTP3 is still marked as down.
> 
> Some diagnostics:
> Asterisk side:
> 
> testomt*CLI> ss7 show linkset 1
> SS7 flags: 0x0
> SS7 linkset 1 status: Down
> SS7 calling nai: -1
> SS7 called nai: -1
> SS7 nationalprefix:
> SS7 internationalprefix: 00
> SS7 unknownprefix:
> SS7 networkroutedprefix:
> SS7 subscriberprefix:
> Switch type: ITU
> Our point code: 11
> SLS shift: 0
> numlinks: 1
> numsps: 1
>   ---------------------------------
>   Adjacent SP PC: 1026 STATE: DOWN
>   TRA:  SENT    T19: not running T21: not running
>   Routes:
>     DPC       State        T6       T10
>   Link ADJ_PC:SLC: 1026:0 NetMngSLS: 0
>     State:      INSERVICE,  UP
>     STD Test:  passed
>     Got, sent :
>     Inhibit:
>     Changeover: NO
>     Tx buffer:  0
>     Tx queue:   0
>     Retrans pos 0
>     CO buffer:  0
>     CB buffer:  0
>     Last FSN:   122
>     MTP3timers:
> 
> EWSD side:
> DISPC7LSET:LSNAM=LS.ASTDEVEL;                                     EXEC'D
> 
> CCS7 -- DISPLAY SIGN. ELEMENTS -- SIGNALING LINK SET
> 
> LSNAM        DPC           NETIND LSNO LSK OST INH EST ALTYPE   PERLTEST
> ------------+-------------+------+----+---+---+---+---+--------+--------
> LS.ASTDEVEL   0- 11        NAT0    13   0  ACT NO  ACT CCSLSNAC ON
> 
> INTERRUPTION TEXT JOB 2275
> 
> 
> 
> CONTINUATION TEXT 0001
> 
> TSTCZ/AD061D1882E/GTS1632P169-3590/003                13-03-26  09:28:27
> 2275 10.2.25.1/PATR                2871/03922
> 
> CCS7 -- DISPLAY SIGN. ELEMENTS -- SIGNALING LINK
> 
> LSNAM: LS.ASTDEVEL
> DPC  :  0- 11         NETIND: NAT0
> 
> LCOD LINKNO SILTNO LTYPE   OST IST EST  REAS
> ----+------+------+-------+---+---+----+------
>   0     10     13  D64BWM  ACT NOT ACT
> 
> INTERRUPTION TEXT JOB 2275
> 
> 
> 
> CONTINUATION TEXT 0002
> 
> TSTCZ/AD061D1882E/GTS1632P169-3590/003                13-03-26  09:28:27
> 2275 10.2.25.1/PATR                2871/01074
> 
> CCS7 -- DISPLAY SIGN. ELEMENTS  -- ACTUAL LINKS IN SIGN. LINK SET
> 
> LSNAM         L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12 L13 L14 L15 L16
> --------------------------------------------------------------------
> LS.ASTDEVEL   0  0  0  0  0  0  0  0  0  0   0   0   0   0   0   0
> 
> END JOB 2275
> 
> You can see ACT under OST in the linkset display, which means "Active".
> 
> 
> My Asterisk ss7 config:
> usecallingpres=1
> 
> signalling=ss7
> ;
> ; Variant of SS7 signalling:
> ; Options are itu and ansi
> ss7type=itu
> 
> ; SS7 Called Nature of Address Indicator
> ;
> ; unknown:        Unknown
> ; subscriber:     Subscriber
> ; national:       National
> ; international:  International
> ; dynamic:        Dynamically selects the appropriate dialplan
> ;
> ss7_called_nai=dynamic
> ;
> ; SS7 Calling Nature of Address Indicator
> ;
> ; unknown:        Unknown
> ; subscriber:     Subscriber
> ; national:       National
> ; international:  International
> ; dynamic:        Dynamically selects the appropriate dialplan
> ;
> ss7_calling_nai=dynamic
> ;
> ;
> ; sample 1 for Germany
> ss7_internationalprefix=00
> ss7_nationalprefix=
> ss7_subscriberprefix=
> ss7_unknownprefix=
> ;
> 
> ; This option is used to disable automatic sending of ACM when the call is started
> ; in the dialplan.  If you do use this option, you will need to use the Proceeding()
> ; application in the dialplan to send ACM.
> ss7_explictacm=yes
> 
> ; ============== TST CZ ===============
> 
> ; All settings apply to linkset 1
> linkset=1
> slc=0
> 
> ; Point code of the linkset.  For ITU, this is the decimal number
> ; format of the point code.  For ANSI, this can either be in decimal
> ; number format or in the xxx-xxx-xxx format
> pointcode=11
> 
> ; Point code of node adjacent to this signalling link (Possibly the STP between you and
> ; your destination).  Point code format follows the same rules as above.
> adjpointcode=1026
> 
> ; Default point code that you would like to assign to outgoing messages (in case of
> ; routing through STPs, or using A links).  Point code format follows the same rules
> ; as above.
> defaultdpc=1026
> 
> ; What the MTP3 network indicator bits should be set to.  Choices are
> ; national, national_spare, international, international_spare
> networkindicator=national
> 
> 
> ; First signalling channel
> sigchan=1
> 
> group=1
> 
> context=from_ss7
> 
> faxdetect=no
> 
> ; Begin CIC (Circuit indication codes) count with this number
> cicbeginswith=2
> ; Channels to associate with CICs on this linkset
> channel=2-5
> 
> setvar=FAXOPT(gateway)=yes
> 
> Thank you for the patience while reading this.
> With regards,
>   Pavel
> 
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