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Why does Keypad facility messages not work with H.323?
Posted by Elena Brambilla, Last modified by Daniel Lizaola on 12 December 2017 04:40 PM
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| In ISDN supplementary service can be invoked by means of thekeypad protocol. A service can be invoked with the digitsequence *21#. The phone sends these digits as information element 'Keypad Facility' and not as informationelement 'called party number'. As the H.323 protocol does not dispose of a way to transport 'keypad facility'information it gets lost.On the contrary H.323+ (H.323 Annex M3) is a tunneling protocol for the transparent transport of ISDN over H.323and thus inherently supports 'keypad facility'.Note that on some phones it is required to explicitly switch to keypad facility mode in order to send a specificdigit sequence as info element 'keypad facility'. | |
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