I narrowed down the problem to a comparison made in this function: send_rtpp_command(struct rtpp_node *node, struct iovec *v, int vcnt)  line 1618

inside the rtpproxy.c file (kamailio-4.2/kamailio/modules/rtpproxy/rtpproxy.c, lines 1693, 1694 ) if (len >= (v[0].iov_len - 1)     && memcmp(buf, v[0].iov_base, (v[0].iov_len - 1)) == 0) What I see is this: kamailio starts up and sends 4 requests to rtpproxy to verify these versions: /* Supported version of the RTP proxy command protocol */ #define SUP_CPROTOVER   20040107 /* Required additional version of the RTP proxy command protocol */ #define REQ_CPROTOVER   "20050322" /* Additional version necessary for re-packetization support */ #define REP_CPROTOVER   "20071116" #define PTL_CPROTOVER   "20081102"

In all those requests the function "send_rtpp_command" is used. The proxy sends/recv inside a for loop (at max rtpproxy_retr tries) and when the proxy receives something is when it does the comparison: if (len >= (v[0].iov_len - 1)     && memcmp(buf, v[0].iov_base, (v[0].iov_len - 1)) == 0) len has the number of bytes received and the v[0].iov_base has the pid_v when checking the  SUP_CPROTOVER.rtpproxy receives "13582_0 V" and replies with 20040107#012 ex: Oct 29 13:37:31 ip-10-0-2-68 rtpproxy[14268]: DBUG:get_command: received command "13582_0 V" Oct 29 13:37:31 ip-10-0-2-68 rtpproxy[14268]: DBUG:rtpc_doreply: sending reply "20040107#012"

and it is comparing 2 diff things so the comparison fails and the logic goes to the "badproxy" label where the test is flag as failed and hence the rtpproxy is marked as unavailable and all the other version checks are stopped

when checking for REQ_CPROTOVER it sends 13582_1 VF 20050322 and receives "1#012", the comparison should fail for the same reason

Oct 29 13:37:31 ip-10-0-2-68 rtpproxy[14268]: DBUG:get_command: received command "13582_1 VF 20050322" Oct 29 13:37:31 ip-10-0-2-68 rtpproxy[14268]: DBUG:rtpc_doreply: sending reply "1#012"

etc etc. I commented out all the sections inside the rtpp_test function that go to the "error" label and also inside rtpp_checkcap I always return 1. Now at the end when running ./kamctl fifo nh_show_rtpp it looks enabled:

[root@ip-10-0-2-68 sbin]# ./kamctl fifo nh_show_rtpp which: no greadlink in (/sbin:/bin:/usr/sbin:/usr/bin:/) which: no gdb in (/sbin:/bin:/usr/sbin:/usr/bin:/) udp:127.0.0.1:7722::  set=0         index:: 0         disabled:: 0         weight:: 1         recheck_ticks:: 95595268 [root@ip-10-0-2-68 sbin]#

but I dont know how safe this is. I dont know if when I start using it (sending other commands to modify SDP etc) it will still work Can somebody tell me which version of both apps (kamailio and rtpproxy) are fully compatible? txs a lotjp2014

On Monday, October 27, 2014 8:22 PM, Juan Perez juan_perez_2014@yahoo.com wrote:

I installed Kamailio 4.2 and the latest rtpproxy. When starting Kamailio I see these lines:

Oct 27 21:54:26 ip-10-0-2-68 kamailio: DEBUG: <core> [sr_module.c:590]: load_module(): load_module: trying to load </usr/local Oct 27 21:54:26 ip-10-0-2-68 kamailio: DEBUG: <core> [sr_module.c:357]: register_module(): register PV from: rtpproxy Oct 27 21:54:26 ip-10-0-2-68 kamailio: DEBUG: <core> [cfg.lex:1724]: pp_define(): defining id: MOD_rtpproxy Oct 27 21:54:32 ip-10-0-2-68 ./kamailio[3887]: ERROR: rtpproxy [rtpproxy.c:1707]: send_rtpp_command(): timeout waiting reply f Oct 27 21:54:32 ip-10-0-2-68 ./kamailio[3887]: ERROR: rtpproxy [rtpproxy.c:1716]: send_rtpp_command(): proxy <udp:10.0.2.68:77 Oct 27 21:54:32 ip-10-0-2-68 ./kamailio[3887]: WARNING: rtpproxy [rtpproxy.c:1573]: rtpp_test(): can't get version of the RTP Oct 27 21:54:32 ip-10-0-2-68 ./kamailio[3887]: WARNING: rtpproxy [rtpproxy.c:1610]: rtpp_test(): support for RTP proxy <udp:10 Oct 27 21:54:37 ip-10-0-2-68 ./kamailio[3898]: ERROR: rtpproxy [rtpproxy.c:1707]: send_rtpp_command(): timeout waiting reply f Oct 27 21:54:37 ip-10-0-2-68 ./kamailio[3898]: ERROR: rtpproxy [rtpproxy.c:1716]: send_rtpp_command(): proxy <udp:10.0.2.68:77 Oct 27 21:54:37 ip-10-0-2-68 ./kamailio[3898]: WARNING: rtpproxy [rtpproxy.c:1573]: rtpp_test(): can't get version of the RTP

I run rtpproxy like this: /usr/local/rtpproxy-install-dir/bin/rtpproxy -l <public ip here> -s udp:10.0.2.68:7722 -F -d DBUG:LOG_LOCAL3

I have these linee in the kamailio.cfg file

loadmodule "rtpproxy.so"

# ----- rtpproxy params ----- modparam("rtpproxy", "rtpproxy_sock", "udp:10.0.2.68:7722")

I have tried with localhost, with 127.0.0.1 and get the same results ( I mean configure kamailio to contact rttpproxy with localhost instead of ip and at the same time running rtpproxy with the same reference.

I can see the rtpproxy running/listening

[root@ip-10-0-2-68 sbin]# netstat -lnp  | grep rtpproxy udp        0      0 10.0.2.68:7722              0.0.0.0:*                               3608/rtpproxy

I can also see these lines: [root@ip-10-0-2-68 sbin]# netstat -np  | grep 7722 udp        0      0 10.0.2.68:49772             10.0.2.68:7722              ESTABLISHED 3928/./kamailio udp        0      0 10.0.2.68:36097             10.0.2.68:7722              ESTABLISHED 3897/./kamailio udp        0      0 10.0.2.68:49158             10.0.2.68:7722              ESTABLISHED 3906/./kamailio udp        0      0 10.0.2.68:37129             10.0.2.68:7722              ESTABLISHED 3904/./kamailio udp        0      0 10.0.2.68:39052             10.0.2.68:7722              ESTABLISHED 3926/./kamailio udp        0      0 10.0.2.68:38161             10.0.2.68:7722              ESTABLISHED 3919/./kamailio udp        0      0 10.0.2.68:53144             10.0.2.68:7722              ESTABLISHED 3887/./kamailio udp        0      0 10.0.2.68:39721             10.0.2.68:7722              ESTABLISHED 3905/./kamailio udp        0      0 10.0.2.68:59563             10.0.2.68:7722              ESTABLISHED 3909/./kamailio udp        0      0 10.0.2.68:51884             10.0.2.68:7722              ESTABLISHED 3921/./kamailio udp        0      0 10.0.2.68:46902             10.0.2.68:7722              ESTABLISHED 3930/./kamailio udp        0      0 10.0.2.68:33981             10.0.2.68:7722              ESTABLISHED 3931/./kamailio udp        0      0 10.0.2.68:60221             10.0.2.68:7722              ESTABLISHED 3898/./kamailio udp        0      0 10.0.2.68:35651             10.0.2.68:7722              ESTABLISHED 3900/./kamailio udp        0      0 10.0.2.68:33105             10.0.2.68:7722              ESTABLISHED 3927/./kamailio udp        0      0 10.0.2.68:43349             10.0.2.68:7722              ESTABLISHED 3887/./kamailio udp        0      0 10.0.2.68:39259             10.0.2.68:7722              ESTABLISHED 3899/./kamailio udp        0      0 10.0.2.68:35170             10.0.2.68:7722              ESTABLISHED 3907/./kamailio udp        0      0 10.0.2.68:38760             10.0.2.68:7722              ESTABLISHED 3908/./kamailio

In the rtpproxy I see that it is sent data and it replies too, I even got a wireshark capture showing that as well:

Oct 27 21:54:41 ip-10-0-2-68 rtpproxy[3608]: DBUG:get_command: received command "3931_2 V" Oct 27 21:54:41 ip-10-0-2-68 rtpproxy[3608]: DBUG:rtpc_doreply: sending reply "20040107#012" Oct 27 21:54:41 ip-10-0-2-68 rtpproxy[3608]: DBUG:get_command: received command "3927_2 V" Oct 27 21:54:41 ip-10-0-2-68 rtpproxy[3608]: DBUG:rtpc_doreply: sending reply "20040107#012" Oct 27 21:54:41 ip-10-0-2-68 rtpproxy[3608]: DBUG:get_command: received command "3926_2 V" Oct 27 21:54:41 ip-10-0-2-68 rtpproxy[3608]: DBUG:rtpc_doreply: sending reply "20040107#012" Oct 27 21:54:41 ip-10-0-2-68 rtpproxy[3608]: DBUG:get_command: received command "3928_2 V" Oct 27 21:54:41 ip-10-0-2-68 rtpproxy[3608]: DBUG:rtpc_doreply: sending reply "20040107#012"

But somehow kamailio does not see it:

[root@ip-10-0-2-68 sbin]# ./kamctl fifo nh_show_rtpp which: no greadlink in (/sbin:/bin:/usr/sbin:/usr/bin:/) which: no gdb in (/sbin:/bin:/usr/sbin:/usr/bin:/) udp:10.0.2.68:7722::  set=0         index:: 0         disabled:: 1         weight:: 1         recheck_ticks:: 53253287

I even when to the kamailio code and saw something that may have something to do with it but havent tried it yet:, in the implementation of the function "send_rtpp_command" I see that the socket created is using TCP. But I tried configuring kamailio/rtpproxy to use tcp instead but I also got the same results, kamailio seems to fail to acknoledgwe the replies from rtpproxy. I also have SELINUX disabled and the iptables are not running.

I dont know what else to check, if somebody can shed some light into this I'd appreciate it.

jp2014