[asterisk-dev] asterisk sending connects when it shouldn't

[Simone Cittadini]

When asterisk receives those messages you hear when calling an 
unreacheable cellular phone it sends a 'connect' over the terminating 
PRI line (digium TE410P), making the call seen as billed from customer's 
perspective.
I don't know if this behaviour is a bug or something I can resolve with 
some fine tuning, so I'm sending to both lists.
Since the calls comes from a SIP connected GSM gateway, is there some 
SIP code which corresponds to the 'pass audio but don't connect' we want 
here ?

that's roughly the extension :


exten => _X.,1,AGI(agi://127.0.0.1:54321/SomeAgiHere?someArgumentsHere)
exten => _X.,n,GotoIf($["${CALLABLE}"="TRUE"]?chkmax:hangup)
exten => _X.,n(chkmax),Set(GROUP()=${TECH_PRE})
exten => _X.,n,GotoIf($[${GROUP_COUNT(${TECH_PRE})} >= 
${MAX_CALLS}]?hangup:dial)
exten => _X.,n(dial),Dial(${STR_DIAL})
exten => _X.,n(hangup),Hangup

exten => h,1,Set(CDR(userfield)=${USERFIELD}-${HANGUPCAUSE})



Here the provider's trace of a call answered by asterisk :

/HDLU 4/Port
   === LAPD ===
    --- ADDRESS ---
    SAPI       : 0 = call control procedures
    CR         : ......1.
    EA0        : .......0
    TEI        : 0 = non-automatic TEI assignment user equipment
    EA1        : .......1
    --- CONTROL ---
    --- I FRAME ---
    I FORMAT   : .......0
    N(S)       : 86
    P          : .......0
    N(R)       : 31
    === ETSI ISDN ===
     PROT DISC  : 08h = Q.931 user-network call control message
     LEN CALL R : 2
     SPARE      : 0
     FLAG       : 1....... = the message is sent to the side that 
originates the call reference
     CALL REF   : 226
     MESS TYPE  : 07h = Connect


Here the complete trace :

/HDLU 4/Port
  0  TEI:  0  CALL REF:  226  Setup  '500'  '[called number]'
  0  TEI:  0  CALL REF:  226  Setup acknowledge
  0  TEI:  0  CALL REF:  226  Call proceeding
  0  TEI:  0  CALL REF:  226  Connect  <== should not
  0  TEI:  0  CALL REF:  226  Connect acknowledge
  0  TEI:  0  CALL REF:  226  Disconnect   16 normal call clearing
  0  TEI:  0  CALL REF:  226  Release
  0  TEI:  0  CALL REF:  226  Release complete


---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Here a trace from a correctly functioning non-voip system :

/HDLU 4/Port
  0  TEI:  0  CALL REF:  246  Setup  '500'
  0  TEI:  0  CALL REF:  246  Setup acknowledge
  0  TEI:  0  CALL REF:  246  Information  'c'
  0  TEI:  0  CALL REF:  246  Information  'a'
  0  TEI:  0  CALL REF:  246  Information  'l'
  0  TEI:  0  CALL REF:  246  Information  'l'
  0  TEI:  0  CALL REF:  246  Information  'e'
  0  TEI:  0  CALL REF:  246  Information  'd'
  0  TEI:  0  CALL REF:  246  Information  'n'
  0  TEI:  0  CALL REF:  246  Information  'u'
  0  TEI:  0  CALL REF:  246  Information  'm'
  0  TEI:  0  CALL REF:  246  Information  'b'
  0  TEI:  0  CALL REF:  246  Call proceeding
  0  TEI:  0  CALL REF:  246  Progress
  0  TEI:  0  CALL REF:  246  Progress
  0  TEI:  0  CALL REF:  246  Disconnect   16 normal call clearing
  0  TEI:  0  CALL REF:  246  Release
  0  TEI:  0  CALL REF:  246  Release complete

-- 
Simone Cittadini
2K Elektronika
Tel +39.02.26265583