[Asterisk-Users] Q: ISDN / E1-PRI - fax problems - Receiving and setting of Service Indicator (SIN) / Bearer Capability (BC) / High Level Compatibility (HLC) / Low Level Compatibility (LLC)

[Niksa Baldun]

Yeah, I also noticed that * lacks the ability to forward calls based on
the type of call, but I have no idea whether this issue has any priority
with the development team. It is probably better to ask this question on
Asterisk-Dev mailing list.


Frank Sautter wrote:

> hi,
>
> i have the problem that i'm not able to set and receive the Service
> Indication (SIN) from our E1-PRI and from our ericsson BP250.
>
> The problem is, that the Bearer Capability (BC) together with the High
> Level Compatibility (HLC) and Low Level Compatibility (LLC) forms the
> Service Indicator (SIN).
> The SIN is used to determine if the call is voice, fax or data. It's
> essential to set the SIN so the called party is able which device has
> to answer a call (e.g. telephone or fax)
>
> as far as i dug into the source neither the BC nor the HLC or LLC data
> is forwarded to a dialplan variable and only the BC is decoded in libpri.
>
> has anyone a solution for this?
>
> is there any usable documentation on the HLC or LLC octets (bytes)?
> i searched etsi and was overwhelmed with the searchresults (1531).
> what i need to modify libpri would be a table of possible values and
> where to find the HLC and LLC fields in the D-Channel.
>
> regards
>  frank
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