To answer my own question after digging around a bit in the code. HOLD seems to just tell FS that it shouldnt do anything with the channel unless something else happens. SWITCH_EVENT_CHANNEL_PARK is what I was looking for. On 10/4/07, Jonas Gauffin <jonas.gauffin@gmail.com> wrote:
Hello
I'm originating a call from one phone (caller) to another (destination). Both are registered in FreeSwitch.
Why do the destination phone get a channel_state HOLD event just after channel_state RING? Isn't hold only supposed to be sent when the user actually put's someone on hold?
I'm wondering since I'm handling all channel events in a switch monitoring program, and I should show "offering" (a call is being offered to the phone) and not "onhold" in this case.
I'm not posting this as a bug since it might just be me who doesnt understand the event flow (in that case, please explain why the HOLD state is there and how I can see when the call is actually being put on hold).
The log (just those two events, tell me if you need the whole log):
Content-Length: 2237 Content-Type: text/event-plain
Channel-State: CS_RING Channel-State-Number: 2 Channel-Name: sofia/mydomain.com/jonas Unique-ID: 87689d22-084d-5243-bfe5-e4284bdc0f8a Caller-Username: arne Caller-Dialplan: XML Caller-Caller-ID-Name: arne Caller-Caller-ID-Number: arne Caller-Network-Addr: 192.168.1.100 Caller-Destination-Number: mydomain.com/jonas Caller-Unique-ID: 3c07eae2-c633-314a-8bb0-0a7489631648 Caller-Source: mod_sofia Caller-Context: default Caller-Channel-Name: sofia/mydomain.com/arne%40mydomain.com%3A5060 Caller-Channel-Created-Time: 1191488351994829 Caller-Channel-Answered-Time: 0 Caller-Channel-Hangup-Time: 0 Caller-Channel-Transfer-Time: 0 Caller-Screen-Bit: yes Caller-Privacy-Hide-Name: no Caller-Privacy-Hide-Number: no Originator-Username: arne Originator-Dialplan: XML Originator-Caller-ID-Name: arne Originator-Caller-ID-Number: arne Originator-Network-Addr: 192.168.1.100 Originator-Destination-Number: 8335 Originator-Unique-ID: 3c07eae2-c633-314a-8bb0-0a7489631648 Originator-Source: mod_sofia Originator-Context: default Originator-Channel-Name: sofia/mydomain.com/arne%40mydomain.com%3A5060 Originator-Screen-Bit: yes Originator-Privacy-Hide-Name: no Originator-Privacy-Hide-Number: no variable_signal_bond: 3c07eae2-c633-314a-8bb0-0a7489631648 variable_local_media_ip: 192.168.1.102 variable_switch_m_sdp: v%3D0%0D%0Ao%3D-%2084341423%2029230295%20IN%20IP4%20192.168.1.100%0D%0As%3DSIP%20CALL%0D%0Ac%3DIN%20IP4%20192.168.1.100%0D%0At%3D0%200%0D%0Am%3Daudio%201722%20RTP/AVP%2018%204%200%208%203%20101%0D%0Aa%3Drtpmap%3A18%20G729/8000%0D%0Aa%3Drtpmap%3A4%20G723/8000%0D%0Aa%3Drtpmap%3A0%20PCMU/8000%0D%0Aa%3Drtpmap%3A8%20PCMA/8000%0D%0Aa%3Drtpmap%3A3%20GSM/8000%0D%0Aa%3Drtpmap%3A101%20telephone-event/8000%0D%0Aa%3Dfmtp%3A101%200-15%0D%0A variable_originator_codec: PCMU%408000k%4020i variable_max_forwards: 70 variable_originator: 3c07eae2-c633-314a-8bb0-0a7489631648 variable_local_media_port: 16392 Event-Name: CHANNEL_STATE Core-UUID: 4cbb1411-28c6-cc49-a1f2-8fbe8a8e5a2c Event-Date-Local: 2007-10-04%2010%3A59%3A11 Event-Date-GMT: Thu,%2004%20Oct%202007%2008%3A59%3A11%20GMT Event-Date-timestamp: 1191488351994829 Event-Calling-File: switch_channel.c Event-Calling-Function: switch_channel_perform_set_state Event-Calling-Line-Number: 746
Content-Length: 476 Content-Type: text/event-plain
Channel-State: CS_HOLD Channel-State-Number: 6 Channel-Name: sofia/mydomain.com/jonas Unique-ID: 87689d22-084d-5243-bfe5-e4284bdc0f8a Event-Name: CHANNEL_STATE Core-UUID: 4cbb1411-28c6-cc49-a1f2-8fbe8a8e5a2c Event-Date-Local: 2007-10-04%2010%3A59%3A11 Event-Date-GMT: Thu,%2004%20Oct%202007%2008%3A59%3A11%20GMT Event-Date-timestamp: 1191488351994829 Event-Calling-File: switch_channel.c Event-Calling-Function: switch_channel_perform_set_state Event-Calling-Line-Number: 746
Thanks, Jonas