SIP Methods
This page describes how Yate handles the SIP requests depending on the request method.
Contents |
What is a SIP Request Method?
A SIP request method defines the nature and the purpose of the SIP request.
This the list of SIP request methods:
- INVITE - Requests a session.
- ACK - Final response to the INVITE
- OPTIONS - Ask for server capabilities
- BYE - Terminates a session
- PRACK - Similar to ACK, but a provisional confirmation.
- CANCEL - Cancel any pending requests.
- REGISTER - Registers the client with the server according to the address in the To he
- INFO - Sends information in the middle of a session that doesn't modify the session's state.
- SUBSCRIBE -Subscribes the device for an event notification.
- NOTIFY - Notifies all subscribers of an event.
- PUBLISH - Publishes an event to a server.
- REFER - Asks the client to issue a SIP request, typically a call transfer.
- MESSAGE - Sends an instant message using SIP.
- UPDATE - Modifies a session's state without altering the dialog state.
SIP Methods in Yate
In Yate some SIP requests are handled internally while others are handled generically.
When a SIP request comes in Yate, depending on the request method it will be either handled in ysipchan module(internally handled), or an internal yate message named sip.methodname will be sent(generically handled).
Generically handled methods are not handled in ysipchan module. A yate message is sent for them and the handling is done in other modules/external scripts. Some methods have yate modules that handle them while others don't, so you need to define the handling of the message in a custom way when enabling them.
Internally handled Methods
Internally handled request methods are requests handled directly by ysipchan module. Yate messages like sip.methodname won't be generated for them.
The methods are handled internally by Yate:
- methods that are always handled when ysipchan module is enabled
- INVITE
- CANCEL
- ACK
- BYE
- methods that are handled in the default configuration and that can be enabled/disabled from [general] section
- INFO - controlled by info setting. If request is received during a dialog initiated by an INVITE and it's used for application/dtmf-relay or application/dtmf then it's handled internally. Outside a dialog it's handled generically.
- OPTIONS - controlled by options setting.
- methods that are handled in the default configuration when yate is started in server mode, and are disabled when yate is started in client mode. They can be enabled/disabled from [general] section
- REFER - controlled by transfer setting
- REGISTER - controlled by register setting. If register=enabled then [registrar] section defines how Yate will work as a SIP REGISTRAR. Before starting yate as SIP registrar set users in regfile.conf or in register.conf.
- methods that are disabled in the default configuration but can be enabled/disabled from [general] section
- PRACK - controlled by prack setting
Generically handled Methods
In order to handle other methods besides those listed above you must enable them in [methods] section.
When Yate receives a request for one of the enabled methods, it will generate a generic SIP message. This message will be handled from a module or from an external script.
- INFO - if it's receive outside a dialog started by an INVITE request, or it's not for application/dtmf or application/dtmf-relay
SIP generic message
SIP generic messages are messages generated by the ysipchan module on receiving the specified requests in [methods] section.
The syntax is: sip.methodname, where methodname is the name of the received SIP request (e.g. sip.subscribe).
Parameters
- xsip_dlgtag
- The dialog tag of the received request.
- request_uri
- The request URI of the received SIP method.
- xsip_type
- The content type header.
- sip_headername
- Where headername is the name of the header received with the request. This parameter is repeated for each header in the request (e.g. sip_from, sip_to, etc).
Return
A module processing this message should set the 'code' parameter of the message to a SIP response code. The processing module may also set message's parameters named osip_headername to be returned in the SIP response (e.g. osip_Expires).
Examples
Enable MESSAGE Method
This example allows chat and short files transfer between Twinkle clients using MESSAGE Request Method.
A MESSAGE request method transports instant messages using SIP.
regexroute.conf:
[extra]
sip.message=120
msg.route=25
msg.execute=90
[sip.message]
${xsip_type}^$=415
.*=echo Got SIP MESSAGE type '${xsip_type}' ${xsip_body_encoding} from '${username}': ${xsip_body}
.*=enqueue msg.execute;caller=${caller};called=${called};\
domain=${domain};callto=lateroute/${called};\
body_encoding=${xsip_body_encoding};type=${xsip_type};text=${xsip_body}
.*=200
[msg.route]
.*=rename call.route;message=msg.route
[msg.execute]
${callto}^sip/\(sip:.*\)$=rename xsip.generate;\
method=MESSAGE;uri=\1;sip_From=<sip:${caller}@${domain$nosuch.dom}>;\
xsip_type=${type$text/plain};xsip_body_encoding=${body_encoding};\
xsip_body=${text}
In ysipchan.conf:
[general] maxpkt=4096 generate=yes [methods] message=yes
To configure twinkle clients, register users in regfile.conf:
[123] password=mypass123 [234] password=mypass234
If sniffer is enabled in telnet:
- This is the sip.message received by Yate, when writing a message from user 123 to user 345.
<sip:INFO> 'udp:0.0.0.0:5062' received 381 bytes SIP message from 192.168.168.156:5060 [0x890f858]
MESSAGE sip:234@192.168.168.156 SIP/2.0 Via: SIP/2.0/UDP 192.168.168.156;rport;branch=z9hG4bKmibzipmn Max-Forwards: 70 To: <sip:234@192.168.168.156> From: "DanielaGrigore" <sip:123@192.168.168.156>;tag=hhzbn Call-ID: xgjfitpjqqffbmz@localhost.localdomain CSeq: 427 MESSAGE Content-Type: text/plain;charset=utf-8 User-Agent: Twinkle/1.4.1 Content-Length: 12
hello Monica------ <sip:INFO> 'udp:0.0.0.0:5062' sending code 100 0x894ac90 to 192.168.168.156:5060 [0x890f858]
SIP/2.0 100 Trying Via: SIP/2.0/UDP 192.168.168.156;rport=5060;branch=z9hG4bKmibzipmn;received=192.168.168.156 From: "DanielaGrigore" <sip:123@192.168.168.156>;tag=hhzbn To: <sip:234@192.168.168.156> Call-ID: xgjfitpjqqffbmz@localhost.localdomain CSeq: 427 MESSAGE Server: YATE/4.2.1 Content-Length: 0
Sniffed 'user.auth' time=1352472395.761205
thread=0x890d348 'YSIP EndPoint' data=(nil) retval='(null)' param['protocol'] = 'sip' param['method'] = 'MESSAGE' param['uri'] = 'sip:234@192.168.168.156' param['ip_host'] = '192.168.168.156' param['ip_port'] = '5060' param['ip_transport'] = 'UDP' param['address'] = '192.168.168.156:5060' param['newcall'] = 'false' param['domain'] = '192.168.168.156' param['device'] = 'Twinkle/1.4.1'
Returned false 'user.auth' delay=0.000299
thread=0x890d348 'YSIP EndPoint' data=(nil) retval='(null)' param['protocol'] = 'sip' param['method'] = 'MESSAGE' param['uri'] = 'sip:234@192.168.168.156' param['ip_host'] = '192.168.168.156' param['ip_port'] = '5060' param['ip_transport'] = 'UDP' param['address'] = '192.168.168.156:5060' param['newcall'] = 'false' param['domain'] = '192.168.168.156' param['device'] = 'Twinkle/1.4.1' param['handlers'] = 'monitoring:1,regfile:100'
<sip:INFO> 'udp:0.0.0.0:5062' sending code 401 0x8957ad8 to 192.168.168.156:5060 [0x890f858]
SIP/2.0 401 Unauthorized Via: SIP/2.0/UDP 192.168.168.156;rport=5060;branch=z9hG4bKmibzipmn;received=192.168.168.156 From: "DanielaGrigore" <sip:123@192.168.168.156>;tag=hhzbn To: <sip:234@192.168.168.156> Call-ID: xgjfitpjqqffbmz@localhost.localdomain CSeq: 427 MESSAGE WWW-Authenticate: Digest realm="Yate", nonce="46386e7c622e18ae3f33b524d110cea6.1352472395", stale=FALSE, algorithm=MD5 Server: YATE/4.2.1 Allow: ACK, INVITE, BYE, CANCEL, REGISTER, REFER, OPTIONS, INFO, MESSAGE Content-Length: 0
Sniffed 'sip.message' time=1352472395.780609 thread=0x890d348 'YSIP EndPoint' data=(nil) retval='(null)' param['username'] = '123' param['realm'] = 'Yate' param['ip_transport'] = 'UDP' param['newcall'] = 'false' param['domain'] = '192.168.168.156' param['device'] = 'Twinkle/1.4.1' param['connection_id'] = 'general' param['connection_reliable'] = 'false' param['username'] = '123' param['called'] = '234' param['caller'] = '123' param['callername'] = 'DanielaGrigore' param['antiloop'] = '19' param['address'] = '192.168.168.156:5060' param['ip_host'] = '192.168.168.156' param['ip_port'] = '5060' param['ip_transport'] = 'UDP' param['sip_uri'] = 'sip:234@192.168.168.156' param['sip_callid'] = 'xgjfitpjqqffbmz@localhost.localdomain' param['xsip_dlgtag'] = '2078093122' param['sip_to'] = '<sip:234@192.168.168.156>' param['sip_from'] = '"DanielaGrigore" <sip:123@192.168.168.156>;tag=hhzbn' param['sip_content-type'] = 'text/plain;charset=utf-8' param['sip_user-agent'] = 'Twinkle/1.4.1' param['xsip_type'] = 'text/plain' param['xsip_body'] = 'hello Monica' Got SIP MESSAGE type 'text/plain' from '123': hello Monica <RegexRoute:ALL> Enqueueing new message 'msg.execute' by rule #3 '.*' in context 'sip.message' Returned true 'sip.message' delay=0.001392 thread=0x890d348 'YSIP EndPoint' data=(nil) retval='200' param['username'] = '123' param['realm'] = 'Yate' param['ip_transport'] = 'UDP' param['newcall'] = 'false' param['domain'] = '192.168.168.156' param['device'] = 'Twinkle/1.4.1' param['connection_id'] = 'general' param['connection_reliable'] = 'false' param['username'] = '123' param['called'] = '234' param['caller'] = '123' param['callername'] = 'DanielaGrigore' param['antiloop'] = '19' param['address'] = '192.168.168.156:5060' param['ip_host'] = '192.168.168.156' param['ip_port'] = '5060' param['ip_transport'] = 'UDP' param['sip_uri'] = 'sip:234@192.168.168.156' param['sip_callid'] = 'xgjfitpjqqffbmz@localhost.localdomain' param['xsip_dlgtag'] = '2078093122' param['sip_to'] = '<sip:234@192.168.168.156>' param['sip_from'] = '"DanielaGrigore" <sip:123@192.168.168.156>;tag=hhzbn' param['sip_content-type'] = 'text/plain;charset=utf-8' param['sip_user-agent'] = 'Twinkle/1.4.1' param['xsip_type'] = 'text/plain' param['xsip_body'] = 'hello Monica' param['handlers'] = 'regexroute:120'
msg.execute
Sniffed 'msg.execute' time=1352472395.781897 thread=0x89228a8 'Engine Worker' data=(nil) retval='(null)' param['caller'] = '123' param['called'] = '234' param['domain'] = '192.168.168.156' param['callto'] = 'lateroute/234' param['body_encoding'] = param['type'] = 'text/plain' param['text'] = 'hello Monica'
msg.route
Sniffed 'msg.route' time=1352472395.781897
thread=0x89228a8 'Engine Worker'
data=(nil)
retval='(null)'
param['caller'] = '123'
param['called'] = '234'
param['domain'] = '192.168.168.156'
param['body_encoding'] =
param['type'] = 'text/plain'
param['text'] = 'hello Monica'
param['handlers'] = 'lateroute:75'
<RegexRoute:ALL> Renaming message 'msg.route' to 'call.route' by rule #1 '.*' in context 'msg.route'
<INFO> Could not route call to '234' in context 'default', wasted 178 usec
<regfile:INFO> Routed '234' via 'sip/sip:234@192.168.168.11(null)'
Returned true 'call.route' delay=0.003463
thread=0x89228a8 'Engine Worker'
data=(nil)
retval='sip/sip:234@192.168.168.11'
param['caller'] = '123'
param['called'] = '234'
param['domain'] = '192.168.168.156'
param['body_encoding'] =
param['type'] = 'text/plain'
param['text'] = 'hello Monica'
param['handlers'] = 'lateroute:75,regexroute:25,cdrbuild:50,iax:100,h323:100,jingle:100,regexroute:100,sip:100,regfile:100'
param['message'] = 'msg.route'
param['oconnection_id'] = 'general'
param['driver'] = 'sip'
<INFO> Late routing call to 'lateroute/234' via 'sip/sip:234@192.168.168.11'
<RegexRoute:ALL> Renaming message 'msg.execute' to 'xsip.generate' by rule #1 '${callto}^sip/\(sip:.*\)$' in context 'msg.execute'
<sip:INFO> SipHandler::received() [0x890ec68]
Returned true 'xsip.generate' delay=0.003973
thread=0x89228a8 'Engine Worker'
data=(nil)
retval='(null)'
param['caller'] = '123'
param['called'] = '234'
param['domain'] = '192.168.168.156'
param['body_encoding'] =
param['type'] = 'text/plain'
param['text'] = 'hello Monica'
param['handlers'] = 'lateroute:75,regexroute:25,cdrbuild:50,iax:100,h323:100,jingle:100,regexroute:100,sip:100,regfile:100,regexroute:90,sip:110'
param['message'] = 'msg.route'
param['oconnection_id'] = 'general'
param['driver'] = 'sip'
param['callto'] = 'sip/sip:234@192.168.168.11'
param['method'] = 'MESSAGE'
param['uri'] = 'sip:234@192.168.168.11'
param['sip_From'] = '<sip:123@192.168.168.156>'
param['xsip_type'] = 'text/plain'
param['xsip_body_encoding'] =
param['xsip_body'] = 'hello Monica'
Enable SUBSCRIBE Method
ysipchan.conf
[methods] subscribe=yes
You then configure the allowed events for subscribing in sipfeatures.conf and define the logic for SUBSCRIBE/NOTIFY in subscription.conf.
See also
