sr-users April 2010

sr-users@lists.kamailio.org

65 participants
103 discussions

by Kelvin Chua

currently using kamailio 3.0 with around 1000 users. Apr 21 10:19:57 kamvm-1 /usr/local/sbin/kamailio[28511]: ERROR: dialog [dlg_handlers.c:218]: bad sip message or missing Contact hdr Apr 21 10:19:57 kamvm-1 /usr/local/sbin/kamailio[28511]: ERROR: dialog [dlg_handlers.c:350]: could not add further info to the dialog Apr 21 10:19:57 kamvm-1 kernel: kamailio[28511]: segfault at 0000000000000088 rip 00002ab61b62779a rsp 00007fffec157440 error 4 Apr 21 10:19:57 kamvm-1 /usr/local/sbin/kamailio[28507]: ALERT: <core> [main.c:722]: child process 28511 exited by a signal 11 Apr 21 10:19:57 kamvm-1 /usr/local/sbin/kamailio[28507]: ALERT: <core> [main.c:725]: core was generated Kelvin Chua

13 years, 12 months

new features: write access to branch attributes

by Daniel-Constantin Mierla

Hello, yesterday I committed to git new feature that allow write access to branch attributes. It is about branches kept in core before TM takes over and creates the branches for transaction. These branches are filled when you do location lookup, alias db lookup or append_branch in route block. You can update the attributes: - r-uri - outbound proxy address (dst uri) - path - q value - local socket to be used for sending - branch flags More at: http://sip-router.org/wiki/cookbooks/pseudo-variables/devel#branch_attribut… The access can be done with index, 0 is the first. Negative value of index starts counting from the last, therefore index -1 is the last branch. If the index is missing, then first branch is used. Adding a new branch can be done with km_append_branch(...) of kex module or append_branch() functions. Dropping a branch is by assigning $null to uri attribute of branch. Among benefits: - drop invalid branches before creating the transaction - you can lookup the aor from branches in location table, avoiding a loopback of a branch (e.g., for alias db case) Cheers, Daniel -- Daniel-Constantin Mierla * http://www.asipto.com/ * http://twitter.com/miconda * http://www.linkedin.com/in/danielconstantinmierla

13 years, 12 months

Catching internally generated BYE event & other

by Alex Balashov

Hello, I am using the dialog module to time out excessively long calls: modparam("dialog", "default_timeout", 21600) # 6 hours modparam("dialog", "dlg_flag", 2) ... route { ... ... setflag(2); $dlg_ctx(timeout_bye) = 2; ... ... if(!t_relay()) sl_reply_error(); } I have two unrelated questions: 1) Why does $dlg_ctx(timeout_bye) work here? My understanding is that $dlg_ctx(...) is a PV namespace container that exposes some aspect of the allocated dialog tracking structure. The dialog structure is created via a TM->dialog callback triggered by t_relay(); why is it possible to access it prior to that point? 2) The spoofed BYEs that are generated by the proxy with this setting do not show up as sequential requests, nor are catchable in script at all. As a result, BYE events are not written to CDRs with 'acc' and I have no way of knowing when the call actually closed. What is the most efficient and canonical solution to this problem? I can think of two: (a) Define a $dlg_ctx(timeout_route) and have it write a BYE event artificially using acc_db_request(). (b) Loop the BYE request back to the proxy with some sort of differentiating URI parameter or similar that causes it to be dropped instead of forwarded. But this is really nasty. What is your suggestion? Thanks, -- Alex Balashov - Principal Evariste Systems LLC 1170 Peachtree Street 12th Floor, Suite 1200 Atlanta, GA 30309 Tel: +1-678-954-0670 Fax: +1-404-961-1892 Web: http://www.evaristesys.com/

13 years, 12 months

Appended headers are not added in serial forking

by Iñaki Baz Castillo

Hi, I receive a request, append some custom headers and use "load_gws()" (from LCR module). If the first gateway fails I do "next_gw()" and this second request to the second gateway doesn't contain the previously appended custom headers. Is it the expected behavior? -- Iñaki Baz Castillo <ibc(a)aliax.net>

13 years, 12 months

SQLOps question

by Maciej Bylica

Hello, I am trying to use SQLOps Module in my kamailio 1.5 configuration. According to your explanations every result of sql_query should be freed just after using that data. So it means that there will be better to fetch for THE SAME data three times instead of just one. Am I right? But nevertheless I've been trying to query just one and free the result of the sql_query at the end of the file. Could sb tell me if the result of sql query executed in the main part of the script is remembered and could be used on failure route as well? Thanks, Maciej.

13 years, 12 months

Re: [SR-Users] Unregister when tcp connection timeout

by Daniel-Constantin Mierla

please keep the mailing list cc-ed, others may benefit of this discussion, participate with ideas or solutions. On 4/20/10 9:18 PM, Bruno Bresciani wrote: > Thank you for your help Daniel... I was reading the source code to > understand the parameter "connection_timeout" in the TLS module 3.0.x > version and check if it help me too. When timer "connection_timeout" > expire, the function that die idle tls connection cold generate a user > unregister regarding this connection. That event happens in a different place than location service and a location record does not keep reference to the connection, therefore you need to do a bit of coding. Cheers, Daniel > > > 2010/4/20 Daniel-Constantin Mierla <miconda(a)gmail.com > <mailto:miconda@gmail.com>> > > > > On 4/20/10 8:29 PM, Daniel-Constantin Mierla wrote: > > > > On 4/20/10 7:30 PM, Iñaki Baz Castillo wrote: > > 2010/4/20 Bruno Bresciani<bruno.bresciani(a)gmail.com > <mailto:bruno.bresciani@gmail.com>>: > > Hi people, this is my first time that I writing to > this list and I nedd some > help... When kamailio lost connection with a user > registred over TLS > (timeout for examlple), I want this user be unregister > in kamailio too. How > can I make this unregister? > > It's a commendable feature request, but it's not > implemented right now. > > > it might now be easy to catch connection lost (forward or wait > state case). > > > ^^^ I meant: it might NOT be easy ... > > E.g., for forward case, detection is after config processing, when > trying to relay. If there are many branches, it is not even > reported if one branch succeeds or sends another negative reply code. > > > > Also, unregistering a contact is not really following the rfc, > anyhow, this is not something complex to add if you have the > contact details. > > What you can do right now is to avoid trying to send if the > connection is not longer open, see: > http://www.kamailio.org/dokuwiki/doku.php/core-cookbook:3.0.x#set_forward_n… > > > Contact is in memory, but no penalty for performances. Very > useful for NAT cases or when UA is supposed to keep the > connection open. > > Cheers, > Daniel > > > -- > Daniel-Constantin Mierla * http://www.asipto.com/ * > http://twitter.com/miconda * > http://www.linkedin.com/in/danielconstantinmierla > > -- Daniel-Constantin Mierla * http://www.asipto.com/ * http://twitter.com/miconda * http://www.linkedin.com/in/danielconstantinmierla

13 years, 12 months

Unregister when tcp connection timeout

by Bruno Bresciani

Hi people, this is my first time that I writing to this list and I nedd some help... When kamailio lost connection with a user registred over TLS (timeout for examlple), I want this user be unregister in kamailio too. How can I make this unregister? Thank you...

13 years, 12 months

PVs in Regular Expression Transformations

by jh＠tutpro.com

i tried to embed a PV in regex transformation, but didn't get desired result. is it possible or must regex only contain strings. here is an example, where the idea is to strip string "456" from the end of string "123456": $var(test) = "123456"; $var(rest) = "456"; $var(test) = $(var(test){re.subst,/^(.*)$var(rest)$/\1/}); xlog("result is $var(test)\n"); unfortunately, the result is 0 rather than "123". i also tried $var(test) = $(var(test){re.subst,/^(.*)\$var(rest)$/\1/}); and $var(test) = $(var(test){re.subst,/^(.*)$(var(rest))$/\1/}); but still 0. -- juha

13 years, 12 months

[Kamailio-Users] new module: embedded lua

by Daniel-Constantin Mierla

Hello, few weeks ago I uploaded a new module named app_lua, providing functionality to execute Lua (http://www.lua.org) scripts in your configuration file. Lua is small and fast, therefore fits very well in a sip proxy environment. It has a lot of extensions, so when you cannot do something with existing cfg functions, check this one as well. The readme and the api are available at: http://sip-router.org/wiki/api/lua/devel http://sip-router.org/docbook/sip-router/branch/master/modules/app_lua/app_… The API will be enhanced during this development cycle, your feedback will help a lot in this direction. By now you get access to pseudo-variables, sip headers, logging functions and sl module. For new comers in community, if you are a Perl fan, then you can use the perl module in a similar way. Also, another module was uploaded recently, app_python, allowing to write python extensions. Module and API for Python are not yet documented, but I think this is not a barrier for a true Python fan, actually I hope will be a motivation to contribute the docs :-) Cheers, Daniel -- Daniel-Constantin Mierla SIP Server Professional Solutions * http://www.asipto.com/

13 years, 12 months

Striping Character from $rU

by dotnetdub

Hi, Running 1.53 and also 3.01 I know there are operators to strip() and strip_tail() to remove characters from the front and end of a uri - what would people recommend to make sure that the uri only ever contains numerical value? If I wanted to for example strip the - character what would be the best way? TIA. Stephen.

14 years

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sr-users April 2010