[SR-Users] kamailio as UAC and NAPTR / sendsocket question

[Karsten Horsmann]

Hi List,

after reading the corebook in the wiki and some issue reports (1), I think
it's not possible to force the outgoing ip for uac.so registration.

I saw traffic with
172.20.120.53:45689 - - - > reg.sip-trunk.telekom.de

So that's random highport generated traffic tcp traffic on the first
interface ip.

AFAIK this behavior could not change, right?

(1)
https://github.com/kamailio/kamailio/issues/1532


Karsten Horsmann <khorsmann at gmail.com> schrieb am Fr., 21. Juni 2019, 11:44:

> Hi List,
>
>
> I try to register to Deutsche Telekom and there product Deutschland Lan
> siptrunk.
>
> Thats works find but i see an intressting behaviour on selecting the right
> outgoing interface.
> Kamailio is sending out with tcp the REQUEST via first private ip
> configured on that server (172.20.120.53).
> There is no listen directive for that.
>
> I forced NAPTR to use tcp or udp and i assume that kamailio got the right
> dns answers.
>
> On the list i read also that i can use force_send_socket to force the
> outgoing request.
>
> Now my idea - hey i use the $rP for the outgoing to select the right
> outgoing listen directive.
> $rP - reference to transport protocol of R-URI
> But to my surprise the logfile told me thats "UDP" - it sends out via TCP
> (thats okay).
>
> Whats an good transport selector variable from kamailio that works?
>
>
> event_route[tm:local-request] {
>   if(!is_method("OPTIONS")) {
>         xlog("L_INFO", "[tm:local-request] request [$rm] from [$fu] to
> [$ru] [$rP]\n");
>   }
> }
>
> INFO: <script>: [tm:local-request] request [REGISTER] from [
> sip:+49XXXXXXXX at sip-trunk.telekom.de] to [sip:sip-trunk.telekom.de] [UDP]
>
>
> listen=tcp:2xx.xx.xx.xx:5060
> listen=udp:2xx.xx.xx.xx:5060
> listen=tls:2xx.xx.xx.xx:5061 advertise CFG_EXT_NAME:5061
>
>
> listen=udp:172.20.120.55:5060
> listen=udp:172.20.120.56:5060
> listen=udp:172.20.120.57:5060
> listen=udp:172.20.120.58:5060
> listen=tcp:172.20.120.58:5060
>
>
> use_dns_cache=on # use internal DNS cache
> use_dns_failover=on # depends on internal DNS cache
> dns_srv_loadbalancing=on
> dns_try_naptr=on
> dns_retr_time=1 # seconds before retrying a DNS request
> dns_retr_no=3 # number of DNS retransmissions
> dns_naptr_ignore_rfc=yes # ignore target NAPTR priority
> dns_tcp_pref=30 # TCP has second-highest priority
> dns_udp_pref=10 # use UDP with least priority
> tcp_connection_lifetime=3605 # set higher than registration expires
>
> #dont' restore
> modparam("uac","restore_mode","none")
> modparam("uac","restore_dlg",0)
>
> ## UAC REGISTER
> #!ifdef WITH_UAC_REGISTER
> modparam("uac", "reg_contact_addr", "CFG_PROD_IP")
> modparam("uac", "reg_timer_interval", 10)
> modparam("uac", "reg_retry_interval", 10)
> modparam("uac", "reg_db_url", DBURL)
> modparam("uac", "restore_mode", "none")
> modparam("uac", "auth_username_avp", "$avp(AVP_AUTH_USERNAME)")
> modparam("uac", "auth_password_avp", "$avp(AVP_AUTH_PASSWORD)")
> modparam("uac", "auth_realm_avp", "$avp(AVP_AUTH_REALM)")
> #!endif
>
>
>
> ip a l
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
> default qlen 1000
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>     inet 127.0.0.1/8 scope host lo
>        valid_lft forever preferred_lft forever
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> state UP group default qlen 1000
>     link/ether 00:50:56:b5:c1:48 brd ff:ff:ff:ff:ff:ff
>     inet 172.20.120.53/24 brd 172.20.120.255 scope global ens192
>        valid_lft forever preferred_lft forever
>     inet 2xx.xx.xx.xx/29 scope global ens192
>        valid_lft forever preferred_lft forever
>     inet 172.20.120.56/24 scope global secondary ens192
>        valid_lft forever preferred_lft forever
>     inet 172.20.120.57/24 scope global secondary ens192
>        valid_lft forever preferred_lft forever
>     inet 172.20.120.58/24 scope global secondary ens192
>        valid_lft forever preferred_lft forever
>     inet 172.20.120.55/24 brd 172.20.120.255 scope global secondary ens192
>        valid_lft forever preferred_lft forever
>     inet6 fe80::250:56ff:feb5:c148/64 scope link
>        valid_lft forever preferred_lft forever
>
> default via 172.20.120.253 dev ens192
> 172.20.120.0/24 dev ens192 proto kernel scope link src 172.20.120.53
> 2xx.xx.xx.xx/29 dev ens192 proto kernel scope link src 2xx.xx.xx.xx
>
>
> --
> Kind Regards
> Mit freundlichen Grüßen
> *Karsten Horsmann*
>
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