Eric, I think this is how it works: If extensions.conf has an entry specifying the "D" mode, then the phone patch connection is always "key down". This would be used for a full duplex repeater. If the entry puts the phone in "P" mode then the phone user has to issue a control op-6 to enable the PTT of "key down". Below are some snippets from these files. Hope this helps. Bob Peret KD6LFW -----extensions.conf ------- [extensions] ;this is list of extensions for the halibut exten => 201,1,rpt(2058|P) exten => 201,2,Congestion exten => 202,1,rpt(2058|D) exten => 202,2,Congestion ----rpt.conf ------ 6=autopatchup ; Autopatch up 0=autopatchdn ; Autopatch down 88=cop,6 ; Remote base telephone key ----------------------- ------------=app_rpt.c ------------------ " P - Phone Control mode. This allows a regular phone user to have\n" " full control and audio access to the radio system. For the\n" " user to have DTMF control, the 'phone_functions' parameter\n" " must be specified for the node in 'rpt.conf'. An additional\n" " function (cop,6) must be listed so that PTT control is available.\n" "\n" " D - Dumb Phone Control mode. This allows a regular phone user to\n" " have full control and audio access to the radio system. In this\n" " mode, the PTT is activated for the entire length of the call.\n" " For the user to have DTMF control (not generally recomended in\n" " this mode), the 'dphone_functions' parameter must be specified\n" " for the node in 'rpt.conf'. Otherwise no DTMF control will be\n" " available to the phone user.\n" " ------------------------------------------- Eric Fort wrote:

When a phone patch is established in app_rpt how is keying of the radio handled...vox, dtmf, what? can a full duplex connection (i.e. telephone) be connected with a half duplex (ie remote base radio) device? How does the signal flow for this work? What determines keying?

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