[asterisk-ss7] ss7_called_nai=dynamic parsing bug or config mistake?

[Vahan Yerkanian]

Hi,

Calls to national NAI numbers are working OK, but when I try to call a 
number with a subscriber NAI,
subscriberprefix gets replaced with nationalprefix...

chan_dahdi.conf excerpt:

ss7type=itu
ss7_called_nai=dynamic
ss7_calling_nai=national
ss7_internationalprefix=00
ss7_nationalprefix=0
ss7_networkroutedprefix=N
ss7_unknownprefix=U
ss7_subscriberprefix=S

extensions.ael excerpt:
_1XX            =>      { Dial(DAHDI/g2/S${EXTEN},60); Hangup; }

CLI debug:
     -- Executing [110 at Network:6] Dial("SIP/sip-00000001", 
"DAHDI/g2/S110,60") in new stack
     -- Called g2/S110
Len = 33 [ 82 83 1e c5 c9 81 52 20 62 00 01 00 60 01 0a 00 02 07 05 81 
10 10 01 0f 0a 06 01 13 06 72 20 72 00 ]
FSN: 3 FIB 1
BSN: 2 BIB 1
 >[0] MSU
[ 82 83 1e ]
         Network Indicator: 3 Priority: 0 User Part: ISUP (5)
         [ c5 ]
         OPC 330 DPC 457 SLS 2
         [ c9 81 52 20 ]
                 CIC: 98
                 [ 62 00 ]
                 Message Type: IAM
                 [ 01 ]
                 --FIXED LENGTH PARMS[4]--
                 Nature of Connection Indicator:
                         Satellites in connection: 0
                         Continuity Check: Check not required (0)
                         Outgoing half echo control device: not included (0)
                         [ 00 ]
                 Forward Call Indicators:
                         Nat/Intl Call Ind: call to be treated as a 
national call (0)
                         End to End Method Ind: no end-to-end method(s) 
available (0)
                         Interworking Ind: no interworking encountered (0)
                         End to End Info Ind: no end-to-end information 
available (0)
                         ISDN User Part Ind: ISDN user part used all the 
way (1)
                         ISDN User Part Pref Ind: ISDN user part not 
preferred all the way (1)
                         ISDN Access Ind: originating access ISDN (1)
                         SCCP Method Ind: no indication (0)
                         [ 60 01 ]
                 Calling Party's Category:
                         Category: Ordinary calling subscriber (10)
                         [ 0a ]
                 Transmission Medium Requirements:
                         Speech (0)
                         [ 00 ]
                 --VARIABLE LENGTH PARMS[1]--
                 Called Party Number:
                         Nature of address: 1
                         NI: 0
                         Numbering plan: 1
                         Address signals: 0110#
                         [ 05 81 10 10 01 0f ]
                 --OPTIONAL PARMS--
                 Calling Party Number:
                         Nature of address: 1
                         NI: 0
                         Numbering plan: 1
                         Presentation: 0
                         Screening: 3
                         Address signals: 60270227
                         [ 0a 06 01 13 06 72 20 72 ]

Len = 3 [ 82 83 00 ]
FSN: 3 FIB 1
BSN: 2 BIB 1
 >[0] FISU

Len = 16 [ 83 83 0d c5 4a 41 72 20 62 00 0c 02 00 02 8a 81 ]
FSN: 3 FIB 1
BSN: 3 BIB 1
<[0] MSU
[ 83 83 0d ]
         Network Indicator: 3 Priority: 0 User Part: ISUP (5)
         [ c5 ]
         OPC 457 DPC 330 SLS 2
         [ 4a 41 72 20 ]
                 [ 62 00 ]
                 Message Type: REL
                 [ 0c ]
                 --VARIABLE LENGTH PARMS[1]--
                 Cause Indicator:
                         Coding Standard: 0
                         Location: 10
                         Cause Class: 0
                         Cause Subclass: 1
                         Cause: Unallocated (unassigned) number (1)
                         [ 02 8a 81 ]

Len = 12 [ 83 84 09 c5 c9 81 52 20 62 00 10 00 ]
FSN: 4 FIB 1
BSN: 3 BIB 1
 >[0] MSU
[ 83 84 09 ]
         Network Indicator: 3 Priority: 0 User Part: ISUP (5)
         [ c5 ]
         OPC 330 DPC 457 SLS 2
         [ c9 81 52 20 ]
                 CIC: 98
                 [ 62 00 ]
                 Message Type: RLC
                 [ 10 ]

     -- Hungup 'DAHDI/95-1'


Notice that S110 gets replaced with 0110:

                 Called Party Number:
                         Nature of address: 1
                         NI: 0
                         Numbering plan: 1
                         Address signals: 0110#
                         [ 05 81 10 10 01 0f ]

I've also tried replacing ss7_calling_nai=national with dynamic, but

Am I doing something wrong not noticing something obvious or is it a bug 
in the dynamic nai parsing function?

Thanks in advance for your time,
Kind regards,
Vahan