I am doing the same sir, but in my case, openSIPS is not sending RTP but 
is able to create a sip session with orkaudio. I think it's my openSIPS 
is not configured correctly. I am attaching my config file, please have 
a look. I will appreciate your help sir.



#
# OpenSIPS residential configuration script
#     by OpenSIPS Solutions <[email protected]>
#
# 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 #########

log_level=3
log_stderror=no
log_facility=LOG_LOCAL0

children=4

/* uncomment the following lines to enable debugging */
#debug_mode=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 reverse DNS on IPs */
auto_aliases=no


listen=udp:10.10.10.174:5062 as X.X.X.X:5062   # CUSTOMIZE ME
listen=tcp:10.10.10.174:5062 as X.X.X.X:5062  # CUSTOMIZE ME


####### Modules Section ########

#set module path
mpath="/usr/local/lib64/opensips/modules/"

#### SIGNALING module
loadmodule "signaling.so"

#### StateLess module
loadmodule "sl.so"

#### Transaction Module
loadmodule "tm.so"
modparam("tm", "fr_timeout", 10)
modparam("tm", "fr_inv_timeout", 200)
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)

#### MYSQL module
loadmodule "db_mysql.so"

#### USeR LOCation module
loadmodule "usrloc.so"
modparam("usrloc", "nat_bflag", "NAT")
modparam("usrloc", "db_mode",   2)
modparam("usrloc", "db_url","mysql://remote:[email protected]/opensips") 
# CUSTOMIZE ME


#### REGISTRAR module
loadmodule "registrar.so"
modparam("registrar", "tcp_persistent_flag", "TCP_PERSISTENT")
/* uncomment the next line not to allow more than 10 contacts per AOR */
#modparam("registrar", "max_contacts", 10)
modparam("registrar", "received_avp", "$avp(received_nh)")

#### 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", "db_url","mysql://remote:[email protected]/opensips")
modparam("acc", "db_table_missed_calls", "missed_calls")


#### AUTHentication modules
loadmodule "auth.so"
loadmodule "auth_db.so"
modparam("auth_db", "calculate_ha1", yes)
modparam("auth_db", "password_column", "password")
modparam("auth_db|uri", 
"db_url","mysql://remote:[email protected]/opensips") # CUSTOMIZE ME
modparam("auth_db", "load_credentials", "")

#### ALIAS module
loadmodule "alias_db.so"
modparam("alias_db", 
"db_url","mysql://remote:[email protected]/opensips") # CUSTOMIZE ME

loadmodule "proto_udp.so"
loadmodule "proto_tcp.so" 

## Domain module
loadmodule "domain.so"
modparam("domain", "db_url", "mysql://remote:[email protected]/opensips")
modparam("domain", "db_mode", 1)   # Use caching

## Permission Module
loadmodule "permissions.so"
modparam("permissions", "db_url", 
"mysql://remote:[email protected]/opensips")


### Dialog Module ##
loadmodule "dialog.so"
modparam("dialog", "db_url", "mysql://remote:[email protected]/opensips")
modparam("dialog", "db_mode", 1)
modparam("dialog", "options_ping_interval", 20)
modparam("dialog", "dlg_match_mode", 1)

## SST Module ##
loadmodule "sst.so"
modparam("sst", "sst_flag", "SST_FLAG")
modparam("sst", "min_se", 1800)

### Text OPS Module ##
loadmodule "textops.so"

### NAT Modules
loadmodule "nathelper.so"
modparam("nathelper", "natping_interval", 30)
modparam("nathelper", "ping_nated_only", 1)
modparam("nathelper", "received_avp", "$avp(received_nh)")
modparam("nathelper", "sipping_from", "sip:[email protected]")
modparam("nathelper", "sipping_bflag", "SIP_PING_FLAG") #OPTIONS means PING

## Loading dependency modules for siprec
loadmodule "b2b_entities.so"
loadmodule "siprec.so"

### RTP Proxy###
loadmodule "rtpproxy.so"
modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:22222")
modparam("rtpproxy", "default_set", 1)
####### Routing Logic ########

# main request routing logic

route{
        force_rport();
        setbflag(NAT_FLAG);
        if (nat_uac_test("19")) {
                if (is_method("REGISTER")){
                        fix_nated_register();
                        setbflag(NAT_FLAG);
                        setbflag(SIP_PING_FLAG);
                } else {
                        fix_nated_contact();
                        setflag(NAT_FLAG);
                };
        };
        if (!mf_process_maxfwd_header("10")) {
                send_reply("483","Too Many Hops");
                exit;
        }

        if (has_totag()) {

                # handle hop-by-hop ACK (no routing required)
                if ( is_method("ACK") && t_check_trans() ) {
                        t_relay();
                        exit;
                }

                # sequential request within a dialog should
                # take the path determined by record-routing
                if ( !loose_route() ) {
                        # we do record-routing for all our traffic, so we 
should not
                        # receive any sequential requests without Route hdr.
                        send_reply("404","Not here");
                        exit;
                }

                if (is_method("BYE")) {
                        # do accounting even if the transaction fails
                        do_accounting("log","failed");
                }

                # route it out to whatever destination was set by loose_route()
                # in $du (destination URI).
                if (check_route_param("nat=yes")) {
                        setflag(NAT);
                } 
                route(relay);
                exit;
        }

        # CANCEL processing
        if (is_method("CANCEL")) {
                if (t_check_trans())
                        t_relay();
                exit;
        }

        # absorb retransmissions, but do not create transaction
        t_check_trans();

        if ( !(is_method("REGISTER")  ) ) {
                
                if (is_from_local()) {
                                        
                        # authenticate if from local subscriber
                        # authenticate all initial non-REGISTER request that 
pretend to be
                        # generated by local subscriber (domain from FROM URI 
is local)
                        if (!proxy_authorize("", "subscriber")) {
                                proxy_challenge("", "0");
                                exit;
                        }
                        if (!db_check_from()) {
                                send_reply("403","Forbidden auth ID");
                                exit;
                        }

                        consume_credentials();
                        # caller authenticated
                        
                } else {
                        # if caller is not local, then called number must be 
local
                        
                        if (!is_myself("$rd")) {
                                send_reply("403","Relay Forbidden");
                                exit;
                        }
                }

        }

        # preloaded route checking
        if (loose_route()) {
                xlog("L_ERR",
                        "Attempt to route with preloaded Route's 
[$fu/$tu/$ru/$ci]");
                if (!is_method("ACK"))
                        send_reply("403","Preload Route denied");
                exit;
        }

        # record routing
        if (!is_method("REGISTER|MESSAGE"))
                record_route();

        # account only INVITEs
        if (is_method("INVITE")) {
                
                do_accounting("log");
        }

        
        if (!is_myself("$rd")) {
                append_hf("P-hint: outbound\r\n"); 
                
                route(relay);
        }

        # requests for my domain
        
        if (is_method("PUBLISH|SUBSCRIBE")) {
                send_reply("503", "Service Unavailable");
                exit;
        }

        if (is_method("REGISTER")) {
                # authenticate the REGISTER requests
                if (!www_authorize("", "subscriber")) {
                        www_challenge("", "0");
                        exit;
                }
                
                if (!db_check_to()) {
                        send_reply("403","Forbidden auth ID");
                        exit;
                }
                if ($proto == "tcp")
                        setflag(TCP_PERSISTENT);
                
                if (!save("location"))
                        sl_reply_error();

                exit;
        }

        if ($rU==NULL) {
                # request with no Username in RURI
                send_reply("484","Address Incomplete");
                exit;
        }

        
        # apply DB based aliases
        alias_db_lookup("dbaliases");
        xlog("L_INFO","Request URI before lookup location $ru");
        # do lookup with method filtering
        if (!lookup("location","m")) {
                if (!db_does_uri_exist()) {
                        send_reply("420","Bad Extension");
                        exit;
                }
                
                t_reply("404", "Not Found");
                exit;
        } 

        xlog("L_INFO","Request URI after lookup location $ru");
        xlog("L_INFO","Request domain $rd");
        # when routing via usrloc, log the missed calls also
        if (isbflagset(NAT)) setflag(NAT);
        do_accounting("log","missed");
        route(relay);
}

route[relay] {
        # for INVITEs enable some additional helper routes
        if (is_method("INVITE")){
                 create_dialog('B');
                if (isflagset(NAT_FLAG) && has_body("application/sdp")) {
                        
rtpproxy_offer("froc","X.X.X.X","1","$var(siprec_rtpproxy_socket)");
                        xlog("RTPPROXY Sock used is 
$var(siprec_rtpproxy_socket)");
                        
siprec_start_recording("sip:10.10.10.174:5060",,,"$var(siprec_rtpproxy_socket)");
                        #siprec_start_recording("sip:10.10.10.174:5060");
                }               
                setflag(SST_FLAG);
                create_dialog('B');
                do_accounting("db", "cdr|missed", "acc");
                t_on_branch("per_branch_ops");
                t_on_reply("handle_nat");
                t_on_failure("missed_call");
        }
        if (isflagset(NAT)) {
                add_rr_param(";nat=yes");
        }

        if (!t_relay()) {
                send_reply("500","Internal Error");
        }
        exit;
}




branch_route[per_branch_ops] {
        xlog("new branch at $ru\n");
}


onreply_route[handle_nat] {
        
        xlog("incoming reply\n");
        if (nat_uac_test("1"))
                fix_nated_contact();
        if(is_method("ACK") && has_body("application/sdp")){
                #rtpproxy_answer("froc");
                
rtpproxy_answer("froc","X.X.X.X","1","$var(siprec_rtpproxy_socket)");
        }else if(has_body("application/sdp")){
                # offering rtpproxy on a non ack message
                #rtpproxy_offer("froc","X.X.X.X");
                
rtpproxy_offer("froc","X.X.X.X","1","$var(siprec_rtpproxy_socket)");
        }
}


failure_route[missed_call] {
        if (t_was_cancelled()) {
                exit;
        }

        # uncomment the following lines if you want to block client 
        # redirect based on 3xx replies.
        ##if (t_check_status("3[0-9][0-9]")) {
        ##t_reply("404","Not found");
        ##      exit;
        ##}

        
}




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