POSE Laurent FTRD/DAC/ISS wrote:
Hello, could anybody can explain me why the progress indicator has been set to "forbidden" in the setup message? (H.225v4 ยง7.3.10)
When H.225v1 was standardized, the people active in that effort did not believe it would be required. For reasons of backward compatibility it can not be retro-fitted in the obvious place (although it could be added at the end of the ASN.1 for the particular message).
when H.323 is used in VoIP trunking between 2 ISUP networks, the lack of this information has an impact on the selection of the called ISDN terminal (for exemple : if a fax and a telephone are behind a PABX and if BC=3.1kHz, without the progress indicator, fax terminal can pick up the call instead of the telephone)
Really? It is not at all clear to me how this would work in the called ISDN terminal. There is nothing I can see in the progress indicator to say whether a call is voice or fax. How is the progress indicator used to achieve this?
Regards, Chris -- Dr Chris Purvis -- Development Manager ISDN Communications Ltd, The Stable Block, Ronans, Chavey Down Road Winkfield Row, Berkshire. RG42 6LY ENGLAND Phone: +44 1344 899 007 Fax: +44 1344 899 001
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