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man pages section 3: Networking Library Functions

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Updated: July 2017



sip_enable_trans_logging, sip_enable_dialog_logging, sip_disable_dialog_logging, sip_disable_trans_logging - transaction and dialog logging operations


cc [ flag... ] file... -lsip [ library... ]
#include <sip.h>

int sip_enable_trans_logging(FILE *logfile, int flags);
int sip_enable_dialog_logging(FILE *logfile, int flags);
void sip_disable_dialog_logging();

void sip_disable_trans_logging();


The sip_enable_trans_logging() and sip_enable_dialog_logging() functions enable transaction and dialog logging respectively. The logfile argument points to a file to which the SIP messages are logged. The flags argument controls the amount of logging. The only flag defined in sip.h is SIP_DETAIL_LOGGING. Either transaction or dialog logging, or both, can be enabled at any time. For dialog logging to work, the SIP stack must be enabled to manage dialogs (using SIP_STACK_DIALOGS, see sip_stack_init(3SIP)) when the stack is initialized.

All the messages exchanged within a transaction/dialog is captured and later dumped to a log file when the transaction or dialog is deleted or terminated. Upon termination, each dialog writes to the file the messages that were processed in its context. Similarly, upon termination each transaction writes to the file the messages that were processed in its context.

The sip_disable_trans_logging() and sip_disable_dialog_logging() functions disable the transaction or dialog logging. These functions do not close the files. It is the responsibility of the application to close them.

The log contains the state of the transaction or dialog at the time the message was processed.

Return Values

Upon successful completion, sip_enable_trans_logging() and sip_enable_dialog_logging() return 0. They return EINVAL if logfile is NULL or flags is unrecognized.


Example 1 Dialog logging

The following is an example of dialog logging.

FILE    *logfile;

logfile = fopen("/tmp/ApplicationA", "a+");
sip_enable_dialog_logging(logfile, SIP_DETAIL_LOGGING);

/* Application sends INVITE, recieves 180 and 200 response and dialog is
        created. */
/* Application sends ACK request */
/* Application sends BYE and recieves 200 response */

/* Application disables logging */

The log file will be of the following format.

************* Begin Dialog *************
Digest       : 43854 43825 26120 9475 5415 21595 25658 18538

Dialog State            : SIP_DLG_NEW

Tue Nov 27 15:53:34 2007| Message - 1
INVITE sip:user@example.com SIP/2.0
From: "Me" < sip:me@mydomain.com > ; TAG=tag-from-01
To: "You" < sip:you@yourdomain.com >
Contact: < sip:myhome.host.com >
Call-ID: 1261K6A6492KF33549XM
CSeq: 111 INVITE
CONTENT-TYPE: application/sdp
Via: SIP/2.0/UDP : 5060 ;branch=z9hG4bK-via-EVERYTHINGIDO-05
Record-Route: <sip:server1.com;lr>
Record-Route: <sip:server2.com;lr>

Tue Nov 27 15:53:34 2007| Message - 2
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP : 5060 ;branch=z9hG4bK-via-EVERYTHINGIDO-05
From: "Me" < sip:me@mydomain.com > ; TAG=tag-from-01
To: "You" < sip:you@yourdomain.com >;tag=1
Call-ID: 1261K6A6492KF33549XM
CSeq: 111 INVITE
Contact: <sip:whitestar2-0.East.Sun.COM:5060;transport=UDP>
Record-Route: <sip:server1.com;lr>
Record-Route: <sip:server2.com;lr>
Content-Length: 0

Dialog State            : SIP_DLG_EARLY

/* Entire 200 OK SIP Response */

Dialog State            : SIP_DLG_CONFIRMED

/* Entire ACK Request */

/* Entire BYE Request */
/* Entire 200 OK Response */
************* End Dialog *************


See attributes(5) for descriptions of the following attributes:

Interface Stability

See Also

sip_stack_init(3SIP), attributes(5)