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37468 discussions

[Serusers] CANCEL passed through SER is occasionally ignored by destination switch
by Frank Durda IV 02 Sep '09

02 Sep '09

I have a situation where CANCEL messages sent by the caller through SER are sometimes ignored by the destination switch. These events are infrequent, and seem to be ignored only if they are received in a narrow window between the 100 Trying and the 183 Session Progress or 180 Ringing message. The destination switch eventually emits a 183/180 and even a 200 OK as the called party answers the call of a long-departed caller. I don't believe that this is a race condition, as the called numbers are sometimes wireless parties, who have 4-10 seconds of time between 100 Trying/IAM and 180/183/ACM responses, and I have seen ignored cancels at the beginning and middle of that lengthy period. So a race condition for that large a period with such an infrequent occurrence seems unlikely. The destination (SIP to ISUP gateway) equipment vendor points out that in the dozen samples of this occurring that the branch tag of the CANCEL didn't match the one shown in the INVITE, and per RFC 3261, their decision to ignore the CANCEL seems to be the right one. In particular, section 17.2.3 criteria 1. This immediately made me think of SER and its habit of saving time and memory by not remembering some or all call state unless you tell it to, via various knobs that are turned off by default. However, I can't explain why most cancels that arrive in the same point in the call setup apparently do meet criteria and only a small number don't. It would seem that SER would have mismatched branch tags all the time or never, depending on the knob settings. Any ideas? Thanks in advance.

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[Kamailio-Users] SIP Redirect server
by Meftah Tayeb 01 Sep '09

01 Sep '09

hello all please could anyone help me to use Kamailio a a redirect server from server1.com that is the kamailio redirect server to server2.com that is the registrare server? thanks for any help __________ Information from ESET NOD32 Antivirus, version of virus signature database 4378 (20090828) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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[Kamailio-Users] Symmetric NAT
by David 01 Sep '09

01 Sep '09

Hey, So I have setup a Kamailio server, it works well with most devices, but works terribly with Symmetric NAT. If you haven't already guessed, I am using STUN for NAT traversal. Could some people share there experiences with Symmetric NAT ? I see a lot of places saying that STUN is not good with it, but I haven't found a lot of suggestions for how to handle it. Thanks, David

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[Kamailio-Users] LCR questions ( ping and flags columns )
by Ricardo Martinez 01 Sep '09

01 Sep '09

Hello list. I have a couple of questions about the LCR module. The first one is about the "ping" column in the gw table. I guess this column stores the "results" of execute a ping to the gateways in the LCR.gw table isn't?. So how this "ping" is executed? It is just a simple ICMP message? Or maybe is an OPTIONS sip message to the gateway?. I saw in the lcr_mod.c file some ping_method, ping_interval variables, but in the README file there is nothing about the "ping". Could someone clarify this to me this? Second. In the mysql "gw" table there is a column called "flags". According to the README file it said that this column can store gateways "capabilities". For example, and I hope that someone could guide me here, can i store the maximum channels available per gateway?, and use it to select or not select a gateway according the gateway channels used?. I hope that someone could help me here. Thank in advance, Regards, Ricardo Martinez.-

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[Kamailio-Users] Kamailio wins Best of Open Source award.
by Alex Balashov 31 Aug '09

31 Aug '09

http://www.infoworld.com/d/open-source/best-open-source-software-awards-200… -- Alex Balashov - Principal Evariste Systems Web : http://www.evaristesys.com/ Tel : (+1) (678) 954-0670 Direct : (+1) (678) 954-0671 Mobile : (+1) (678) 237-1775

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[Kamailio-Users] watchers and active_watchers tables
by catalina oancea 31 Aug '09

31 Aug '09

Hi, Could someone please explain the usage of the watchers table? I understand the usage active_watchers, but why the watchers table too? Thanks, Catalina

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[Kamailio-Users] Issue in starting openser-0.9.5 for embedded application
by Ratheendran R 31 Aug '09

31 Aug '09

Hi All, I am using openser-0.9.5 version for embedded application,I am able to sucessfully cross compile(gcc 2.95) it.however the application fails to start. The above SER version is selected based on its compatibility with the cross compiler. below are my observations 1.if I run './openserctl start' from the command line I get the below message printf: No such file or directory PID file /var/run/openser.pid does not exist -- OpenSER start failed 2. If I run './openser' from command line I get the below message Listening on udp: 192.168.1.22 [192.168.1.22]:5060 tcp: 192.168.1.22 [192.168.1.22]:5060 Aliases: Too much shared memory demanded: 33554432 Please guide me in fixing this issue. Thanks in advance. Ratheendran

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[Kamailio-Users] rewriteuser( ) with avp
by Alex R.S.M 31 Aug '09

31 Aug '09

Hi, I'm trying to change "username" field of URI in the INT message. When using rewriteuser() function with avp variable as below, the username is changed to $avp(i:8) itself instead of the value of the avp. rewriteuser("$avp(i:8)"); I've tried all sorts of diff formats and none of them replace username with the value of avp variable.: rewriteuser($avp(i:8)); rewriteuser("avp(i:8)"); is this a bug? Thanks, A-RS _________________________________________________________________ Windows Live: Keep your friends up to date with what you do online. http://windowslive.com/Campaign/SocialNetworking?ocid=PID23285::T:WLMTAGL:O…

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[Kamailio-Users] scope of AVPs (AVP defined when execution of script starts)
by jh＠tutpro.com 29 Aug '09

29 Aug '09

i have always thought that AVPs exits per transaction. that does not seem to be the case, however, because when i put in the beginning of my script xlog("L_INFO", "Caller lcr_id $avp(CALLER_LCR_ID_AVP)\n"); this gets printed to syslog: Aug 29 11:34:34 localhost /usr/sbin/sip-router[10210]: INFO: Caller lcr_id 2 is this the indented behavior? do i really need to delete all AVPs in the beginning of the script in order to make sure that they don't have any values left from processing of previous message? -- juha

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[Kamailio-Users] Phones that support TLS with certificate
by catalina oancea 27 Aug '09

27 Aug '09

Hello, I am trying to find the phones that can use tls with certificate, I mean that the phone doesn't accept incoming calls unless the server certificate is signed by a public authority or manually added to a list. For now my conclusions are: -Snom 360 - works with TLS. But although snom wiki states that a certificate is needed, incoming calls are accepted even if the certificate is not uploaded. -SJPhone - same as snom -Bria - this is the only phone I could find that works only if the certificate is loaded. Has anybody used other phones with tls and can give me a piece of advice? also, maybe I am not configuring Snom right and that's why it doesn't need a certificate, any ideas? Thanks Catalina

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