[OpenSER-Users] rtpproxy seems to be idle

Kovács Zoltán kovzol at matek.hu
Tue Jan 15 01:22:30 CET 2008


Hi,

my plan is to give the possibility for multiple VoIP users within the same
LAN to call each other using OpenSER as the SIP server. I found that if
there is a NATed LAN, two different VoIP users inside the NATed LAN cannot
talk to each other properly, because IP parts of the RTP packets are of the
form of the local network and it is not acceptable by the VoIP software
which is prepared for the IP of the router instead. (I hope I understand
clearly what is going on here.)

As a workaround, I found a suggestion in the internet: using rtpproxy with
OpenSER. As I can understand, all RTP packets are sent to the rtpproxy
process via OpenSER (nathelper module). rtpproxy will behave as a bridge
between the two NATed VoIP clients lying in the same LAN. Both clients will
initiate their RTP/UDP traffic on their own side and answers will come from
the rtpproxy process just for the same UDP pipe. Using this method the
clients do not need to allow incoming UDP traffic, only outgoing traffic
should be enabled (which is usually allowed by default in most LANs).

Here comes my question. I successfully set up OpenSER (version 1.1.x, but I
will migrate to 1.2.x soon). I think I also successfully set up rtpproxy,
but it seems that there is no real traffic between OpenSER and rtpproxy.
Here I attach my command line for running rtpproxy ( 200.200.200.200 is my
public IP of the OpenSER server host; I run rtpproxy on the same server).

-------------------------8X snip here-------------------------------
# rtpproxy -f -l 200.200.200.200 -s unix:/var/run/rtpproxy.sock -r
/home/rtpproxy -S /home/rtpproxy.work
rtpproxy started, pid 24568
received command "V"
sending reply "20040107
"
received command "VF 20050322"
sending reply "1
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "VF 20050322"
sending reply "1
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "V"
sending reply "20040107
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "VF 20050322"
sending reply "1
"
received command "U 3331228473621-29341876517920 at 160.114.144.65
160.114.144.65 10004 196215176;1"
new session 3331228473621-29341876517920 at 160.114.144.65 , tag 196215176;1
requested, type strong
new session on a port 35000 created, tag 196215176;1
pre-filling caller's address with 160.114.144.65:10004
sending reply "35000 212.92.3.218
"
session timeout
RTP stats: 0 in from callee, 0 in from caller, 0 relayed, 0 dropped
RTCP stats: 0 in from callee, 0 in from caller, 0 relayed, 0 dropped
session on ports 35000/0 is cleaned up
-------------------------8X snip here-------------------------------

My debug=7 output for OpenSER, filtered for the string "rtp" comes here (I
had to chown openser.openser /var/run/rtpproxy* for OpenSER to make it
possible to communicate with rtpproxy at all):

-------------------------8X snip here-------------------------------
# tail -f daemon.log | grep rtp
Jan 15 00:27:39 firewall openser: set_mod_param_regex: found <rtpproxy_sock>
in module nathelper [/usr/lib/openser/modules/]
Jan 15 00:27:39 firewall openser: set_mod_param_regex: found
<rtpproxy_disable> in module nathelper [/usr/lib/openser/modules/]
Jan 15 00:27:39 firewall openser: set_mod_param_regex: found
<rtpproxy_disable_tout> in module nathelper [/usr/lib/openser/modules/]
Jan 15 00:27:39 firewall openser: set_mod_param_regex: found <rtpproxy_tout>
in module nathelper [/usr/lib/openser/modules/]
Jan 15 00:27:39 firewall openser: set_mod_param_regex: found <rtpproxy_retr>
in module nathelper [/usr/lib/openser/modules/]
Jan 15 00:27:39 firewall openser: find_cmd_export_t: found
<force_rtp_proxy>(0) in module nathelper [/usr/lib/openser/modules/]
Jan 15 00:27:39 firewall openser: f<force_rtp_proxy>
Jan 15 00:27:39 firewall /usr/sbin/openser[25093]: fixing force_rtp_proxy,
line 443
Jan 15 00:27:39 firewall /usr/sbin/openser[25095]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25096]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25098]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25100]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25106]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25105]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25117]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25103]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25108]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25104]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25112]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25094]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25113]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25093]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25111]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25122]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25118]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25123]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25097]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25107]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25125]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25120]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25115]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25110]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25119]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25116]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25124]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25114]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25121]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25099]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25102]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25109]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:27:40 firewall /usr/sbin/openser[25101]: rtpp_test: RTP proxy
<unix:/var/run/rtpproxy.sock> found, support for it enabled
Jan 15 00:28:21 firewall /usr/sbin/openser[25112]: force_rtp_proxy2: proxy
reply: 35000 212.92.3.218
Jan 15 00:28:27 firewall /usr/sbin/openser[25114]: build_res_from_sip_res:
copied size: orig:77, new: 16, rest: 780 msg= SIP/2.0 200 Ok^M Via:
SIP/2.0/UDP 160.114.144.65:1024;branch=z9hG4bK27994379851422672^M From:
06212527755 <sip:06212527755 at sip.ephone.hu:5060>;tag=196215176^M To:
06212527722 < sip:06212527722 at sip.ephone.hu:5060>;tag=7816428^M Contact: <
sip:06212527722 at 160.114.144.65:5060>^M Record-Route:
<sip:200.200.200.200;lr;ftag=196215176>^M
Call-ID: 3331228473621-29341876517920 at 160.114.144.65^M CSeq: 1 INVITE^M
Content-Type: application/sdp^M Server: X-Lite release 1105d^M
Content-Length: 320^M ^M v=0^M o=06212527722 2057424946 2057430520 IN IP4
160.114.144.65^M s=X-Lite^M c=IN IP4 160.114.144.65^M t=0 0^M m=audio 8000
RTP/AVP 0 8 3 98 97 101^M a=rtpmap:0 pcmu/8000^M a=rtpmap:8 pcma/8000^M
a=rtpmap:3 gsm/8000^M a=rtpmap:98 iLBC/8000^M a=rtpmap:97 speex/8000^M
a=rtpmap:101 telephone-event/8000^M a=fmtp:101 0-15^M a=sendrecv^M
-------------------------8X snip here-------------------------------

My nathelper related part of openser.cfg comes here:

-------------------------8X snip here-------------------------------
loadmodule " nathelper.so"
modparam("nathelper", "natping_interval", 60)
modparam("nathelper", "ping_nated_only", 1)
modparam("nathelper", "received_avp", 42)
modparam("nathelper", "rtpproxy_sock", "unix:/var/run/rtpproxy.sock")
modparam("nathelper", "rtpproxy_disable", 0)
modparam("nathelper", "rtpproxy_disable_tout", 60)
modparam("nathelper", "rtpproxy_tout", 1)
modparam("nathelper", "rtpproxy_retr", 5)
modparam("nathelper", "sipping_method", "OPTIONS")
-------------------------8X snip here-------------------------------

Of course, directories /home/rtpproxy* are empty.

Could somebody please help me why there is no media stream between OpenSER
and rtpproxy?

Your help is greatly appreciated in advance. I am using Debian Etch.

Best regards, Zoltan
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