Channel Drivers

Channel Drivers

Channel drivers connect GABPBX channels to external signaling protocols, devices or internal channel abstractions.

SIP Drivers

Module	Source	Purpose
chan_sofia.so	channels/chan_sofia.c	Sofia-SIP based SIP driver and preferred chan_sip replacement.
chan_sip.so	channels/chan_sip.c	Legacy hand-written SIP driver compatible with Asterisk behavior.

Use only one SIP driver per process because both register public SIP names.

VoIP And Protocol Drivers

Module	Source	Purpose
chan_iax2.so	channels/chan_iax2.c	Inter-GABPBX/Asterisk eXchange v2 protocol.
chan_mgcp.so	channels/chan_mgcp.c	Media Gateway Control Protocol.
chan_skinny.so	channels/chan_skinny.c	Cisco Skinny Client Control Protocol.
chan_unistim.so	channels/chan_unistim.c	Nortel/UNISTIM protocol support.
chan_h323.so	channels/chan_h323.c	OpenH323 channel driver.
chan_ooh323.so	addons/chan_ooh323.c	Objective Systems H.323 add-on channel.
chan_gtalk.so	channels/chan_gtalk.c	Google Talk channel driver.
chan_jingle.so	channels/chan_jingle.c	Jingle channel driver.

Telephony Hardware

Module	Source	Purpose
chan_dahdi.so	channels/chan_dahdi.c	DAHDI analog/digital telephony.
chan_misdn.so	channels/chan_misdn.c	mISDN BRI/PRI support.
chan_phone.so	channels/chan_phone.c	Linux Telephony API support.
chan_vpb.so	channels/chan_vpb.cc	Voicetronix API driver.
chan_mobile.so	addons/chan_mobile.c	Mobile/Bluetooth add-on channel.

Local And Internal Channels

Module	Source	Purpose
chan_local.so	channels/chan_local.c	Local proxy channel used by dialplan and other modules.
chan_bridge.so	channels/chan_bridge.c	Bridge interaction channel.
chan_agent.so	channels/chan_agent.c	Agent proxy channel.
chan_multicast_rtp.so	channels/chan_multicast_rtp.c	Multicast RTP paging channel.

Console, Audio And Test Channels

Module	Source	Purpose
chan_console.so	channels/chan_console.c	Console channel driver.
chan_alsa.so	channels/chan_alsa.c	ALSA console channel.
chan_oss.so	channels/chan_oss.c	OSS console channel.
chan_nbs.so	channels/chan_nbs.c	Network Broadcast Sound support.

Support Source Files

Some files under channels/ are support code, not standalone modules:

Source	Purpose
iax2-parser.c	IAX2 parsing support.
iax2-provision.c	IAX2 provisioning support.
misdn_config.c	mISDN configuration support.
sig_analog.c	Analog signaling support used by DAHDI.
sig_pri.c	PRI signaling support used by DAHDI.
sig_ss7.c	SS7 signaling support used by DAHDI.
console_video.c	Console video support.
vcodecs.c	Video codec helpers.
vgrabbers.c	Video grabber helpers.

Recommended Modern SIP Path

For new SIP deployments, prefer:

chan_sofia.so

Keep chan_sip only for legacy comparison and migration testing.