是否可以将媒体rtp数据包从一个rtpproxy服务器发送到另一个rtapproxy服务器？
在我的场景中，我通过opensips代理服务器注册voip帐户。我们在同一个地方托管了rtpproxy和opensips服务器。opensips相应地更改了SDP的c=和m=行，但当数据包到达voip交换机时，其rtpropxy服务器也会更改SDP。因此，Peer1向hout托管的rtpproxy服务器发送数据包，peer2向voip交换机的rtppoxy服务器发送rtp数据包。
SIP数据包：对等<-->opensips<-->星号
对等RTP数据包1<-->rtpproxy1=X=rtpproxy2<-->peer2
这里在rtpproxy1和rtpproxy2之间没有连接，因此在peer1和peer2之间没有媒体传输。请帮助解决这个问题。
我的opensips.cfg文件如下。
#
# $Id: opensips.cfg 9742 2013-02-05 10:24:48Z vladut-paiu $
#
# OpenSIPS residential configuration script
# by OpenSIPS Solutions <team@opensips-solutions.com>
#
# This script was generated via "make menuconfig", from
# the "Residential" scenario.
# You can enable / disable more features / functionalities by
# re-generating the scenario with different options.#
#
# Please refer to the Core CookBook at:
# http://www.opensips.org/Resources/DocsCookbooks
# for a explanation of possible statements, functions and parameters.
#
####### Global Parameters #########
debug=4
log_stderror=no
log_facility=LOG_LOCAL0
fork=yes
children=4
sip_warning=yes
mhomed=1
/* uncomment the following lines to enable debugging */
#debug=6
#fork=no
#log_stderror=yes
/* uncomment the next line to enable the auto temporary blacklisting of
not available destinations (default disabled) */
#disable_dns_blacklist=no
/* uncomment the next line to enable IPv6 lookup after IPv4 dns
lookup failures (default disabled) */
#dns_try_ipv6=yes
/* comment the next line to enable the auto discovery of local aliases
based on revers DNS on IPs */
auto_aliases=yes
#listen=udp:127.0.0.1:5060 # CUSTOMIZE ME
listen=udp:192.168.1.28:5080
disable_tcp=yes
listen=tcp:192.168.1.28:5080
disable_tls = yes
listen = tls:192.168.1.28:5081
tls_verify_server = 1
tls_verify_client = 1
tls_require_client_certificate = 0
tls_method = TLSv1
tls_certificate = "/usr/local/etc/opensips/tls/server/server-cert.pem"
tls_private_key = "/usr/local/etc/opensips/tls/server/server-privkey.pem"
tls_ca_list = "/usr/local/etc/opensips/tls/server/server-calist.pem"
####### Modules Section ########
#set module path
mpath="/usr/local/lib64/opensips/modules/"
#### Auth db module
loadmodule "db_mysql.so"
loadmodule "auth_db.so"
loadmodule "auth.so"
modparam("auth_db", "db_url", "mysql://root:admin@localhost/opensips")
modparam("auth_db", "calculate_ha1", yes)
modparam("auth_db", "password_column", "password")
modparam("auth_db", "use_domain", 1)
modparam("auth", "nonce_expire", 300)
modparam("auth", "rpid_suffix", ";party=calling;id-type=subscriber;screen=yes")
modparam("auth", "rpid_avp", "$avp(rpid)")
# !! Nathelper
loadmodule "nathelper.so"
#loadmodule "nat_traversal.so"
loadmodule "rtpproxy.so"
loadmodule "textops.so"
# ----------------- setting module-specific parameters ---------------
modparam("rtpproxy", "rtpproxy_sock", "udp:192.168.1.28:7890")
# !! Nathelper
modparam("nathelper","sipping_bflag",7)
modparam("nathelper", "ping_nated_only", 1) # Ping only clients behind NAT
modparam("nathelper", "force_socket", "udp:192.168.1.28:7890")
modparam("nathelper", "nortpproxy_str", "a=sdpmangled:yesrn")
#### SIGNALING module
loadmodule "signaling.so"
#### StateLess module
loadmodule "sl.so"
#### Transaction Module
loadmodule "tm.so"
modparam("tm", "fr_timer", 5)
modparam("tm", "fr_inv_timer", 30)
modparam("tm", "restart_fr_on_each_reply", 0)
modparam("tm", "onreply_avp_mode", 1)
#### Record Route Module
loadmodule "rr.so"
/* do not append from tag to the RR (no need for this script) */
modparam("rr", "append_fromtag", 0)
#### MAX ForWarD module
loadmodule "maxfwd.so"
#### SIP MSG OPerationS module
loadmodule "sipmsgops.so"
#### FIFO Management Interface
loadmodule "mi_fifo.so"
modparam("mi_fifo", "fifo_name", "/tmp/opensips_fifo")
modparam("mi_fifo", "fifo_mode", 0666)
#### URI module
loadmodule "uri.so"
modparam("uri", "use_uri_table", 0)
modparam("uri", "use_domain", 0)
modparam("uri", "db_url", "mysql://root:admin@localhost/opensips")
#### USeR LOCation module
loadmodule "usrloc.so"
modparam("usrloc","nat_bflag",6)
modparam("usrloc", "db_mode", 0)
#### REGISTRAR module
loadmodule "registrar.so"
modparam("registrar", "tcp_persistent_flag", "TCP_PERSISTENT")
modparam("registrar", "default_expires", 3600)
modparam("registrar", "min_expires", 60)
modparam("registrar", "max_expires", 0)
modparam("registrar", "default_q", 0)
modparam("registrar", "case_sensitive", 0)
modparam("registrar", "received_param", "received")
modparam("registrar", "max_contacts", 0)
modparam("registrar", "retry_after", 0)
modparam("registrar", "received_avp", "$avp(i:801)")
/* uncomment the next line not to allow more than 10 contacts per AOR */
#modparam("registrar", "max_contacts", 10)
modparam("registrar","received_avp", "$avp(42)")
modparam("nathelper","received_avp", "$avp(42)")
#### ACCounting module
loadmodule "acc.so"
/* what special events should be accounted ? */
modparam("acc", "early_media", 0)
modparam("acc", "report_cancels", 0)
/* by default we do not adjust the direct of the sequential requests.
if you enable this parameter, be sure the enable "append_fromtag"
in "rr" module */
modparam("acc", "detect_direction", 0)
modparam("acc", "failed_transaction_flag", "ACC_FAILED")
/* account triggers (flags) */
modparam("acc", "log_flag", "ACC_DO")
modparam("acc", "log_missed_flag", "ACC_MISSED")
loadmodule "dialog.so"
#loadmodule "load_balancer.so"
loadmodule "domain.so"
modparam("domain", "db_url","mysql://root:admin@localhost/opensips") # CUSTOMIZE ME
modparam("domain", "db_mode", 1) # Use caching
modparam("auth_db|usrloc|uri", "use_domain", 1)
loadmodule "drouting.so"
modparam("drouting", "db_url","mysql://root:admin@localhost/opensips") # CUSTOMIZE ME
loadmodule "event_route.so"
#loadmodule "mediaproxy.so"
loadmodule "alias_db.so"
modparam("alias_db", "db_url","mysql://root:admin@localhost/opensips") # CUSTOMIZE ME
loadmodule "dialplan.so"
modparam("dialplan", "db_url","mysql://root:admin@localhost/opensips") # CUSTOMIZE ME
#loadmodule "presence_xcapdiff.so"
#loadmodule "permissions.so"
####### Routing Logic ########
# main routing logic
# main request routing logic
route
{
#xlog("L_INFO","CVAPP: route($rm/$du/$fu/$tu)");
#script_trace( 1, "$rm from $si, ruri=$ru", "me");
#xlog("L_INFO", "route[0] New request - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$cin");
# -----------------------------------------------------------------
# Sanity Check Section
# -----------------------------------------------------------------
if (!mf_process_maxfwd_header("10"))
{
xlog("mf_process_maxfwd_header....... n");
sl_send_reply("483", "Too Many Hops");
exit;
};
if (msg:len > 4096)
{
xlog(" method msg:len > 2048 n");
sl_send_reply("513", "Message Overflow");
exit;
};
# -----------------------------------------------------------------
# Record Route Section
# -----------------------------------------------------------------
if (method!="REGISTER")
{
record_route();
}
else
{
if(nat_uac_test("19"))
{
record_route(";nat=yes");
}
else
{
record_route();
}
}
if (method=="BYE" || method=="CANCEL")
{
unforce_rtp_proxy();
}
# -----------------------------------------------------------------
# Loose Route Section nat_uac_test("3")
# -----------------------------------------------------------------
if (loose_route())
{
xlog(" method loose_route() n");
if ((method=="INVITE" || method=="REFER") && !has_totag())
{
sl_send_reply("403", "Forbidden");
exit;
};
if (method=="INVITE")
{
fix_nated_sdp("1");
if (nat_uac_test("19"))
{
xlog(" method fix_nated_contact() n");
#setflag(6);
setbflag(6);
setbflag(7);
setbflag(8);
force_rport();
fix_nated_contact("2");
};
rtpproxy_answer();
};
route(1);
exit;
};
#xlog("L_INFO","CVAPP: has_totag initial request");
/* if(loose_route())
{
if(!has_totag())
{
xlog("L_INFO", "route[0] Initial loose-routing rejected - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$cin");
sl_send_reply("403", "Initial Loose-Routing Rejected");
exit;
}
if(nat_uac_test("19") || search("^Route:.*;nat=yes"))
{
xlog("L_INFO", "route[0] Initial loose-routing 19 - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$cin");
fix_nated_contact();
setbflag(6);
}
xlog("loose_route route5....... n");
route(5);
} */
/* else {
xlog("L_INFO","CVAPP: loose_route was false");
if ( is_method("ACK") ) {
xlog("L_INFO","CVAPP: is ACK");
if ( t_check_trans() ) {
xlog("L_INFO","CVAPP: found matching transaction");
# non loose-route, but stateful ACK; must be an ACK after
# a 487 or e.g. 404 from upstream server
t_relay();
exit;
} else {
xlog("L_INFO","CVAPP: no matching transaction");
# ACK without matching transaction ->
# ignore and discard
exit;
}
}
xlog("L_INFO","CVAPP: sending 404 Not here");
sl_send_reply("404","Not here");
}
*/
# -----------------------------------------------------------------
# Call Type Processing Section
# -----------------------------------------------------------------
if (uri!=myself)
{
#xlog("L_INFO", "uri!=myself1...........n");
route(4);
route(1);
exit;
};
if (method=="ACK")
{
xlog(" method==ACK n");
route(1);
exit;
}
if (method=="CANCEL")
{
xlog(" method==CANCEL n");
route(1);
exit;
}
else if (method=="INVITE")
{
xlog(" method==INVITE n");
route(3);
exit;
}
else if (method=="REGISTER")
{
xlog(" method==REGISTER n");
route(2);
exit;
};
lookup("aliases");
if (uri!=myself)
{
xlog(" uri!=myself2... n");
route(4);
route(1);
exit;
};
if (!lookup("location"))
{
xlog(" !lookup(location) n");
sl_send_reply("404", "User Not Found");
exit;
};
route(1);
}
route[1]
{
# -----------------------------------------------------------------
# Default Message Handler
# -----------------------------------------------------------------
# if client or server know to be behind a NAT, enable relay
if (isflagset(6) || isflagset(7)) {
xlog("route[1] Default Message Handler n");
force_rport();
fix_nated_contact();
rtpproxy_answer();
};
t_on_reply("1");
if (subst_uri('/(sip:.*);nat=yes/1/')){
xlog("subst_uri ..............n");
setbflag(6);
};
if (!t_relay())
{
if (method=="INVITE" && isbflagset(6))
{
unforce_rtp_proxy();
};
sl_reply_error();
};
}
route[2]
{
# -----------------------------------------------------------------
# REGISTER Message Handler
# ----------------------------------------------------------------
xlog("route[2] REGISTER Message Handler n");
if (!search("^Contact:[ ]**") && nat_uac_test("19"))
{
xlog(" !search()...... n");
#setflag(6);
setbflag(6);
setbflag(8);
#fix_nated_register();
fix_nated_contact();
force_rport();
};
sl_send_reply("100", "Trying");
if (!save("location"))
{
sl_reply_error();
};
}
route[3]
{
# -----------------------------------------------------------------
# INVITE Message Handler
# -----------------------------------------------------------------
#if (nat_uac_test("19"))
#{
# setflag(6);
#}
xlog("route[3] INVITE Message Handler n");
#linha incluida por mim para fazer com que todo INVITE utilize o rtpproxy
#setflag(6);
setbflag(6);
setbflag(8);
lookup("aliases");
if (uri!=myself)
{
route(4);
route(1);
exit;
};
if (!lookup("location"))
{
sl_send_reply("404", "User Not Found");
exit;
};
route(4);
route(1);
}
route[4]
{
# -----------------------------------------------------------------
# NAT Traversal Section
# -----------------------------------------------------------------
if (isbflagset(6))
{
force_rport();
fix_nated_contact();
rtpproxy_answer();
}
}
route[5]
{
if(isbflagset(6))
{
xlog("L_INFO", "route[5] ...............");
if(!isflagset(22) && !search("^Content-Length:[ ]*0"))
{
setflag(22);
# force_rtp_proxy();
# fix_nated_sdp("9");
if(has_body("application/sdp"))
{
xlog("L_INFO", "has_body rtpproxy_answer IP...............");
#rtpproxy_offer();
fix_nated_sdp("10","192.168.1.28");
rtpproxy_answer("r","192.168.1.28");
}
}
# if (rtpproxy_offer())
# {
# t_on_reply("2");
# }
t_on_reply("2");
}
else
{
t_on_reply("1");
}
if(!isflagset(21))
{
t_on_failure("1");
}
if(isflagset(29))
{
append_branch();
}
/* if(is_present_hf("Proxy-Authorization"))
{
consume_credentials();
}
*/
xlog("L_INFO", "route[3] Request leaving server, D-URI='$du' - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$cin");
# no 100 (we already sent it) and no DNS blacklisting
# if(!t_relay("0x05"))
if(!t_relay())
{
sl_reply_error();
if(is_method("INVITE") && isbflagset(6))
{
xlog("L_INFO", "route[3] unforce rtp proxyn");
unforce_rtp_proxy();
}
}
exit;
}
onreply_route[1]
{
#rtpproxy_answer();
#force_rport();
#fix_nated_contact();
#rtpproxy_answer();
#rtpproxy_offer("i");
#rtpproxy_answer("cowf","192.168.1.28");
if (is_method("INVITE") || is_method("ACK") )
{
if(has_body("application/sdp"))
{
$var(mline) = $(rb{sdp.line,m});
xlog("The first m line in the SDP body is $var(mline)n");
force_rport();
#fix_nated_contact();
fix_nated_sdp("3");
rtpproxy_offer("i");
}
}
#rtpproxy_answer("cowf","192.168.1.28");
if (isbflagset(6) && status=~"2[0-9][0-9]")
{
if (!search("^Content-Length:[ ]*0"))
{
xlog("onreply_route[1] if1 n");
rtpproxy_answer();
};
};
if (nat_uac_test("1"))
{
xlog("onreply_route[1] if2 n");
fix_nated_contact();
};
}
onreply_route[2]
{
xlog("L_INFO", "onreply_route[2] NAT-Reply - S=$rs D=$rr F=$fu T=$tu IP=$si ID=$cin");
if(nat_uac_test("1"))
{
fix_nated_contact();
}
if(isbflagset(6) && status=~"2[0-9][0-9]")
{
if(!search("^Content-Length:[ ]*0"))
{
#force_rtp_proxy();
xlog("L_INFO", "onreply_route[2] - calling rtpproxy_answer()n");
#fix_nated_sdp("3");
rtpproxy_answer();
}
}
exit;
}
failure_route[1]{
xlog("failure_route[1] if2 n");
}
在onreply_route[2]函数中将r tpproxy_offer(i)更改为rtpproxy_offer("corw")。
rtpproxy_offer("corw");
当第一个SIP代理接收到初始INVITE时，它将在第一个rtpproxy上分配端口并修改SDP主体，以便将目的地为UAC的流量发送到此rtpproxy。当INVITE到达第二个SIP代理(如果是Asterisk，则为B2BUA(时，它将在第二个rtpproxy上分配端口并修改SDP主体，以便将目的地为UAC的流量发送到此rtpproxy。当代理接收到具有SDP主体的回复时，也会发生相反的情况。
因此，交通流量如下：
UAC <-> rtpproxy1 <-> rtpproxy2 <-> UAS
并且，对于两个rtpproxy不存在用于彼此发送业务的特殊配置。每个CCD_ 11被另一个简单地看作UA(UAS或UAC(。