8 Jul
2003
8 Jul
'03
12:41 p.m.
At 06:57 PM 7/8/2003, Younger Wang wrote:
We are using the cisco 7206vxr gear. They report connect/disconnect
messages to syslog as well. As you note we use the TDM disconnect
to re-enforce our SIP BYE messages. Often the SIP BYE is missed.
Account is not compiled with MySQL support by
default.
Simply uncomment the line
# DEFS+=-DSQL_ACC
and recompile again.
But actually, if you want to leverage Acc module for CDR,
you'll get
disappointed probably. In normal situation, you
have no problem. The trouble is, your account information is
based on the SIP message exchange through the ser proxy. If a
called failed after establishment and no further message is
sent by UAC and UAS.
That's actually not an issue specific to SIP -- it is specific to
IP networks. There is just packets and no line which may go
disconnected in a way you could sense. Not too bad as long as
both UAs are native-IP. If you provide PSTN access, you should
buy a PSTN gateway that is able to detect a dead call and initiate
a BYE. Not very different from PSTN -- if you disconnect your
handset, the other call party will hang up sooner or later. If ser proxy queries both side of a call at
certain
intervals, that will be ok. However, I am not sure if SIP
supports such status query.
There is a mechanism called session timer. The idea is simple: make
UA send keep-alive messages. If none arrives, call-stateful elements
in the signaling path can remove call state.
-Jiri
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