It can't be supported on SIP phones because they dial en-bloc, nor can the older simple Hotline feature. It may work in some of the dial failure use cases but that would not likely be useful.
Most 3rd party SIP devices offer Hot-Line operation locally, some may offer the delay operation too. I don't know about the J129.
Last edited by iwebber; 06-13-2017 at 04:38 AM.
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