[Asterisk-Users] ISDN/CAPI outgoing calls - weirdness with ringing

[Armin Schindler]

On Fri, 16 Dec 2005, Michael J. Tubby B.Sc (Hons) G8TIC wrote:
> All,
> 
> I have the following set up:
> 
> Fedora Core 4 box (yum updated to current)
> Asterisk 1.2.1 + Chan_Capi-cm-0.6.1
> AVM C4 card
> 2 x ISDN2e lines bonded with switchboard number, fax number and 10 x DDI 
> numbers from British Telecom
> 14 x Cisco 7960 phones with SIP 7.5
> 
> The ISDN lines work in P2P mode and calls are presented with the last 4 digits
> only - I land them in a context and branch out from there - everything to do
> with incoming calls works just fine!
> 
> I have a problem with outgoing calls that are routed over the BT network and
> the way in which 'ringing' is presented... depending on the called party
> number (hence phone provider) I get different results. For example:
> 
> a) if I dial another BT number I get a fraction of a second's ring followed by
> silence until the called party answers. The Cisco phone displays:
> 
>    Proceeding (in 100)
> 
> very briefly and is almost immediately over-written by:
> 
>    Session Progress (in 183)
> 
> until the called party answers - at no point is Ringing Destination (in 180)
> displayed
> 
> 
> b) if I dial an Orange or O2 mobile number I get a second or two's worrth of
> silence [while the Orange network locates the mobile] then the mobile rings in
> the normal way and the Cisco phone plays out US style ringing. When the number
> is dialled the phone displays:
> 
>    Proceeding (in 100)
> 
> when the mobile starts to ring the Cisco phone displays:
> 
>    Ringng Destination (in 180)
> 
> 
> c) if I dial a Bulldog phone number then I get three messages:
> 
> Proceeding (in 100)  - for a second or so
> Session Progress (in 183) - for a couple of seconds
> Ringng Destination (in 180) - while the called party's phone rings
> 
> 
> d) and the really weird one - if I dial *some* international numbers I get
> both UK (BT) ringing tone overlaid with Asterisk/VoIP (US) ringing tone
> 
> 
> 
> I have two ways of dialling out:
> 
> 1. with an explicit "9" for an outside line -- get dialtone from BT and then
> dial rest of the digits - like a legacy PBX
> 
> 2. dialing just based on the fact that the extension starts with a zero so its
> an outside call via BT
> 
> 
> I have tried all combinations of early B3 connect 'always', 'on success' and
> 'never' and it doesn't appear to change things... the relevant part of
> extensions.conf is below for completness.
> 
> Before I dive in to the next level down:
> 
> - is this a known issue?
> - is there a solutiuon/workaround/patch/fix
> - do I need to get down and dirty with CAPI and SIP debug?
 
Have you tried CAPI-Dial option 'o' ? Together with 'b' it should give
you progress in any case.

Armin
 
> Mike
> 
> 
> 
> 
> ; 
> ;  external-routes: this is where we get to dial out
> ; 
> [external-routes]
> 
> ; 
> ;  outgoing via main ISDN line using explicit "9" for an outside line
> ;  and ISDN eqarly B3 connect ("overlap sending") to drop us to the
> ;  BT provided dialtone and work like a normal/legacy phone system -
> ;  we force the caller ID to our exchange number so that DDI's dont
> ;  leak out
> ; 
> exten => 9,1,NoOp("ISDN: Pickup outside line (early B3 connect) for:
> ${CALLERIDNUM}")
> exten => 9,2,SetCallerId(${THORCOM_MAIN})
> exten => 9,3,Dial(CAPI/g1//b)
> exten => 9,4,Hangup
> 
> ; 
> ;  implicit trunked call - here we could/should do an ENUM look
> ;  up to see if we can place the call via IP and fall back to BT
> ;  if not... just for now this isn't implemented and we always call
> ;  out via BT!!
> ; 
> exten => _0.,1,Dial(CAPI/g1/${EXTEN}/b)                    ; early B3 connect
> always
> ;exten => _0.,1,Dial(CAPI/g1/${EXTEN}/B)                   ; early B3 connect
> on success
> ;exten => _0.,1,Dial(CAPI/g1/${EXTEN})                       ; no special
> options
> exten => _0.,2,Hangup
> 
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