static int pjsip_name_addr_compare( pjsip_uri_context_e context,
const pjsip_name_addr *naddr1,
const pjsip_name_addr *naddr2)
{
int d;
/* Check that naddr2 is also a name_addr */
if (naddr1->vptr != naddr2->vptr)
return -1;
/* I'm not sure whether display name is included in the comparison. */
if (pj_strcmp(&naddr1->display, &naddr2->display) != 0) {
return -1;
}
pj_assert( naddr1->uri != NULL );
pj_assert( naddr2->uri != NULL );
/* Compare name-addr as URL */
d = pjsip_uri_cmp( context, naddr1->uri, naddr2->uri);
if (d)
return d;
return 0;
}
/*! \brief Callback function for finding a contact */
static int registrar_find_contact(void *obj, void *arg, int flags)
{
struct ast_sip_contact *contact = obj;
const struct registrar_contact_details *details = arg;
pjsip_uri *contact_uri = pjsip_parse_uri(details->pool, (char*)contact->uri, strlen(contact->uri), 0);
return (pjsip_uri_cmp(PJSIP_URI_IN_CONTACT_HDR, details->uri, contact_uri) == PJ_SUCCESS) ? CMP_MATCH | CMP_STOP : 0;
}
static int rewrite_contact(pjsip_rx_data *rdata, pjsip_dialog *dlg)
{
pjsip_contact_hdr *contact;
contact = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_CONTACT, NULL);
if (contact && !contact->star && (PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri))) {
pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri);
rewrite_uri(rdata, uri);
if (dlg && pj_list_empty(&dlg->route_set) && (!dlg->remote.contact
|| pjsip_uri_cmp(PJSIP_URI_IN_REQ_URI, dlg->remote.contact->uri, contact->uri))) {
dlg->remote.contact = (pjsip_contact_hdr*)pjsip_hdr_clone(dlg->pool, contact);
dlg->target = dlg->remote.contact->uri;
}
return 0;
}
return -1;
}
static pj_bool_t handle_rx_message(struct ast_sip_endpoint *endpoint, pjsip_rx_data *rdata)
{
pjsip_contact_hdr *contact;
if (!endpoint) {
return PJ_FALSE;
}
if (endpoint->nat.rewrite_contact && (contact = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_CONTACT, NULL)) &&
!contact->star && (PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri))) {
pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri);
pjsip_dialog *dlg = pjsip_rdata_get_dlg(rdata);
pj_cstr(&uri->host, rdata->pkt_info.src_name);
if (strcasecmp("udp", rdata->tp_info.transport->type_name)) {
uri->transport_param = pj_str(rdata->tp_info.transport->type_name);
} else {
uri->transport_param.slen = 0;
}
uri->port = rdata->pkt_info.src_port;
ast_debug(4, "Re-wrote Contact URI host/port to %.*s:%d\n",
(int)pj_strlen(&uri->host), pj_strbuf(&uri->host), uri->port);
/* rewrite the session target since it may have already been pulled from the contact header */
if (dlg && (!dlg->remote.contact
|| pjsip_uri_cmp(PJSIP_URI_IN_REQ_URI, dlg->remote.contact->uri, contact->uri))) {
dlg->remote.contact = (pjsip_contact_hdr*)pjsip_hdr_clone(dlg->pool, contact);
dlg->target = dlg->remote.contact->uri;
}
}
if (endpoint->nat.force_rport) {
rdata->msg_info.via->rport_param = rdata->pkt_info.src_port;
}
return PJ_FALSE;
}
static pj_int32_t calculate_response_expiration(const pjsip_regc *regc,
const pjsip_rx_data *rdata,
unsigned *contact_cnt,
unsigned max_contact,
pjsip_contact_hdr *contacts[])
{
pj_int32_t expiration = NOEXP;
const pjsip_msg *msg = rdata->msg_info.msg;
const pjsip_hdr *hdr;
/* Enumerate all Contact headers in the response */
*contact_cnt = 0;
for (hdr=msg->hdr.next; hdr!=&msg->hdr; hdr=hdr->next) {
if (hdr->type == PJSIP_H_CONTACT &&
*contact_cnt < max_contact)
{
contacts[*contact_cnt] = (pjsip_contact_hdr*)hdr;
++(*contact_cnt);
}
}
if (regc->current_op == REGC_REGISTERING) {
pj_bool_t has_our_contact = PJ_FALSE;
const pjsip_expires_hdr *expires;
/* Get Expires header */
expires = (const pjsip_expires_hdr*)
pjsip_msg_find_hdr(msg, PJSIP_H_EXPIRES, NULL);
/* Try to find the Contact URIs that we register, in the response
* to get the expires value. We'll try both with comparing the URI
* and comparing the extension param only.
*/
if (pjsip_cfg()->regc.check_contact || regc->add_xuid_param) {
unsigned i;
for (i=0; i<*contact_cnt; ++i) {
const pjsip_contact_hdr *our_hdr;
our_hdr = (const pjsip_contact_hdr*)
regc->contact_hdr_list.next;
/* Match with our Contact header(s) */
while ((void*)our_hdr != (void*)®c->contact_hdr_list) {
const pjsip_uri *uri1, *uri2;
pj_bool_t matched = PJ_FALSE;
/* Exclude the display name when comparing the URI
* since server may not return it.
*/
uri1 = (const pjsip_uri*)
pjsip_uri_get_uri(contacts[i]->uri);
uri2 = (const pjsip_uri*)
pjsip_uri_get_uri(our_hdr->uri);
/* First try with exact matching, according to RFC 3261
* Section 19.1.4 URI Comparison
*/
if (pjsip_cfg()->regc.check_contact) {
matched = pjsip_uri_cmp(PJSIP_URI_IN_CONTACT_HDR,
uri1, uri2)==0;
}
/* If no match is found, try with matching the extension
* parameter only if extension parameter was added.
*/
if (!matched && regc->add_xuid_param &&
(PJSIP_URI_SCHEME_IS_SIP(uri1) ||
PJSIP_URI_SCHEME_IS_SIPS(uri1)) &&
(PJSIP_URI_SCHEME_IS_SIP(uri2) ||
PJSIP_URI_SCHEME_IS_SIPS(uri2)))
{
const pjsip_sip_uri *sip_uri1, *sip_uri2;
const pjsip_param *p1, *p2;
sip_uri1 = (const pjsip_sip_uri*)uri1;
sip_uri2 = (const pjsip_sip_uri*)uri2;
p1 = pjsip_param_cfind(&sip_uri1->other_param,
&XUID_PARAM_NAME);
p2 = pjsip_param_cfind(&sip_uri2->other_param,
&XUID_PARAM_NAME);
matched = p1 && p2 &&
pj_strcmp(&p1->value, &p2->value)==0;
}
if (matched) {
has_our_contact = PJ_TRUE;
if (contacts[i]->expires >= 0 &&
contacts[i]->expires < expiration)
{
/* Get the lowest expiration time. */
expiration = contacts[i]->expires;
}
break;
}
our_hdr = our_hdr->next;
} /* while ((void.. */
} /* for (i=.. */
/* If matching Contact header(s) are found but the
* header doesn't contain expires parameter, get the
* expiration value from the Expires header. And
* if Expires header is not present, get the expiration
* value from the request.
*/
if (has_our_contact && expiration == NOEXP) {
if (expires) {
expiration = expires->ivalue;
} else if (regc->expires_hdr) {
expiration = regc->expires_hdr->ivalue;
} else {
/* We didn't request explicit expiration value,
* and server doesn't specify it either. This
* shouldn't happen unless we have a broken
* registrar.
*/
expiration = 3600;
}
}
}
/* If we still couldn't get matching Contact header(s), it means
* there must be something wrong with the registrar (e.g. it may
* have modified the URI's in the response, which is prohibited).
*/
if (expiration==NOEXP) {
/* If the number of Contact headers in the response matches
* ours, they're all probably ours. Get the expiration
* from there if this is the case, or from Expires header
* if we don't have exact Contact header count, or
* from the request as the last resort.
*/
pj_size_t our_contact_cnt;
our_contact_cnt = pj_list_size(®c->contact_hdr_list);
if (*contact_cnt == our_contact_cnt && *contact_cnt &&
contacts[0]->expires >= 0)
{
expiration = contacts[0]->expires;
} else if (expires)
expiration = expires->ivalue;
else if (regc->expires_hdr)
expiration = regc->expires_hdr->ivalue;
else
expiration = 3600;
}
} else {
/* Just assume that the unregistration has been successful. */
expiration = 0;
}
/* Must have expiration value by now */
pj_assert(expiration != NOEXP);
return expiration;
}
static pj_status_t set_contact( pjsip_regc *regc,
int contact_cnt,
const pj_str_t contact[] )
{
const pj_str_t CONTACT = { "Contact", 7 };
pjsip_contact_hdr *h;
int i;
/* Save existing contact list to removed_contact_hdr_list and
* clear contact_hdr_list.
*/
pj_list_merge_last(®c->removed_contact_hdr_list,
®c->contact_hdr_list);
/* Set the expiration of Contacts in to removed_contact_hdr_list
* zero.
*/
h = regc->removed_contact_hdr_list.next;
while (h != ®c->removed_contact_hdr_list) {
h->expires = 0;
h = h->next;
}
/* Process new contacts */
for (i=0; i<contact_cnt; ++i) {
pjsip_contact_hdr *hdr;
pj_str_t tmp;
pj_strdup_with_null(regc->pool, &tmp, &contact[i]);
hdr = (pjsip_contact_hdr*)
pjsip_parse_hdr(regc->pool, &CONTACT, tmp.ptr, tmp.slen, NULL);
if (hdr == NULL) {
PJ_LOG(4,(THIS_FILE, "Invalid Contact: \"%.*s\"",
(int)tmp.slen, tmp.ptr));
return PJSIP_EINVALIDURI;
}
/* Find the new contact in old contact list. If found, remove
* the old header from the old header list.
*/
h = regc->removed_contact_hdr_list.next;
while (h != ®c->removed_contact_hdr_list) {
int rc;
rc = pjsip_uri_cmp(PJSIP_URI_IN_CONTACT_HDR,
h->uri, hdr->uri);
if (rc == 0) {
/* Match */
pj_list_erase(h);
break;
}
h = h->next;
}
/* If add_xuid_param option is enabled and Contact URI is sip/sips,
* add xuid parameter to assist matching the Contact URI in the
* REGISTER response later.
*/
if (regc->add_xuid_param && (PJSIP_URI_SCHEME_IS_SIP(hdr->uri) ||
PJSIP_URI_SCHEME_IS_SIPS(hdr->uri)))
{
pjsip_param *xuid_param;
pjsip_sip_uri *sip_uri;
xuid_param = PJ_POOL_ZALLOC_T(regc->pool, pjsip_param);
xuid_param->name = XUID_PARAM_NAME;
pj_create_unique_string(regc->pool, &xuid_param->value);
sip_uri = (pjsip_sip_uri*) pjsip_uri_get_uri(hdr->uri);
pj_list_push_back(&sip_uri->other_param, xuid_param);
}
pj_list_push_back(®c->contact_hdr_list, hdr);
}
return PJ_SUCCESS;
}
/*
* Test one test entry.
*/
static pj_status_t do_uri_test(pj_pool_t *pool, struct uri_test *entry)
{
pj_status_t status;
int len;
char *input;
pjsip_uri *parsed_uri, *ref_uri;
pj_str_t s1 = {NULL, 0}, s2 = {NULL, 0};
pj_timestamp t1, t2;
if (entry->len == 0)
entry->len = pj_ansi_strlen(entry->str);
#if defined(PJSIP_UNESCAPE_IN_PLACE) && PJSIP_UNESCAPE_IN_PLACE!=0
input = pj_pool_alloc(pool, entry->len + 1);
pj_memcpy(input, entry->str, entry->len);
input[entry->len] = '\0';
#else
input = entry->str;
#endif
/* Parse URI text. */
pj_get_timestamp(&t1);
var.parse_len = var.parse_len + entry->len;
parsed_uri = pjsip_parse_uri(pool, input, entry->len, 0);
if (!parsed_uri) {
/* Parsing failed. If the entry says that this is expected, then
* return OK.
*/
status = entry->status==ERR_SYNTAX_ERR ? PJ_SUCCESS : -10;
if (status != 0) {
PJ_LOG(3,(THIS_FILE, " uri parse error!\n"
" uri='%s'\n",
input));
}
goto on_return;
}
pj_get_timestamp(&t2);
pj_sub_timestamp(&t2, &t1);
pj_add_timestamp(&var.parse_time, &t2);
/* Create the reference URI. */
ref_uri = entry->creator(pool);
/* Print both URI. */
s1.ptr = (char*) pj_pool_alloc(pool, PJSIP_MAX_URL_SIZE);
s2.ptr = (char*) pj_pool_alloc(pool, PJSIP_MAX_URL_SIZE);
pj_get_timestamp(&t1);
len = pjsip_uri_print( PJSIP_URI_IN_OTHER, parsed_uri, s1.ptr, PJSIP_MAX_URL_SIZE);
if (len < 1) {
status = -20;
goto on_return;
}
s1.ptr[len] = '\0';
s1.slen = len;
var.print_len = var.print_len + len;
pj_get_timestamp(&t2);
pj_sub_timestamp(&t2, &t1);
pj_add_timestamp(&var.print_time, &t2);
len = pjsip_uri_print( PJSIP_URI_IN_OTHER, ref_uri, s2.ptr, PJSIP_MAX_URL_SIZE);
if (len < 1) {
status = -30;
goto on_return;
}
s2.ptr[len] = '\0';
s2.slen = len;
/* Full comparison of parsed URI with reference URI. */
pj_get_timestamp(&t1);
status = pjsip_uri_cmp(PJSIP_URI_IN_OTHER, parsed_uri, ref_uri);
if (status != 0) {
/* Not equal. See if this is the expected status. */
status = entry->status==ERR_NOT_EQUAL ? PJ_SUCCESS : -40;
if (status != 0) {
PJ_LOG(3,(THIS_FILE, " uri comparison mismatch, status=%d:\n"
" uri1='%s'\n"
" uri2='%s'",
status, s1.ptr, s2.ptr));
}
goto on_return;
} else {
/* Equal. See if this is the expected status. */
status = entry->status==PJ_SUCCESS ? PJ_SUCCESS : -50;
if (status != PJ_SUCCESS) {
goto on_return;
}
}
var.cmp_len = var.cmp_len + len;
pj_get_timestamp(&t2);
pj_sub_timestamp(&t2, &t1);
pj_add_timestamp(&var.cmp_time, &t2);
/* Compare text. */
if (entry->printed) {
if (pj_strcmp2(&s1, entry->printed) != 0) {
/* Not equal. */
PJ_LOG(3,(THIS_FILE, " uri print mismatch:\n"
" printed='%s'\n"
" expectd='%s'",
s1.ptr, entry->printed));
status = -60;
}
} else {
if (pj_strcmp(&s1, &s2) != 0) {
/* Not equal. */
PJ_LOG(3,(THIS_FILE, " uri print mismatch:\n"
" uri1='%s'\n"
" uri2='%s'",
s1.ptr, s2.ptr));
status = -70;
}
}
on_return:
return status;
}
void ICSCFSproutletTsx::on_rx_initial_request(pjsip_msg* req)
{
pj_pool_t* pool = get_pool(req);
pjsip_route_hdr* hroute = (pjsip_route_hdr*)
pjsip_msg_find_hdr(req, PJSIP_H_ROUTE, NULL);
// TS 24.229 says I-CSCF processing shouldn't be done if a message has more than one Route header.
// We've stripped one off in Sproutlet processing, so check for a second and just forward the
// message if it's there.
if (hroute != NULL)
{
send_request(req);
return;
}
pjsip_uri* next_hop = PJUtils::next_hop(req);
URIClass next_hop_class = URIClassifier::classify_uri(next_hop);
if (req->line.req.method.id == PJSIP_ACK_METHOD &&
next_hop == req->line.req.uri &&
((next_hop_class == NODE_LOCAL_SIP_URI) ||
(next_hop_class == HOME_DOMAIN_SIP_URI)))
{
// Ignore ACK messages with no Route headers and a local Request-URI, as:
// - the I-CSCF should not be handling these
// - we've seen ACKs matching this descrption being generated at overload and looping repeatedly
//
// This is a fairly targeted fix for https://github.com/Metaswitch/sprout/issues/1091.
// TODO: remove this code when #1091 is fixed by other means.
free_msg(req);
return;
}
// Create an ACR for this transaction.
_acr = _icscf->get_acr(trail());
_acr->rx_request(req);
TRC_DEBUG("I-CSCF initialize transaction for non-REGISTER request");
// Before we clone the request for retries, remove the P-Profile-Key header
// if present.
PJUtils::remove_hdr(req, &STR_P_PROFILE_KEY);
// Determine orig/term and the served user's name.
const pjsip_route_hdr* route = route_hdr();
std::string impu;
if ((route != NULL) &&
(pjsip_param_find(&((pjsip_sip_uri*)route->name_addr.uri)->other_param,
&STR_ORIG) != NULL))
{
// Originating request.
TRC_DEBUG("Originating request");
_originating = true;
impu = PJUtils::public_id_from_uri(PJUtils::orig_served_user(req));
SAS::Event event(trail(), SASEvent::ICSCF_RCVD_ORIG_NON_REG, 0);
event.add_var_param(impu);
event.add_var_param(req->line.req.method.name.slen,
req->line.req.method.name.ptr);
SAS::report_event(event);
}
else
{
// Terminating request.
TRC_DEBUG("Terminating request");
_originating = false;
pjsip_uri* uri = PJUtils::term_served_user(req);
// If the Req URI is a SIP URI with the user=phone parameter set, is not a
// GRUU and the user part starts with '+' (i.e. is a global phone number),
// we should replace it with a tel URI, as per TS24.229 5.3.2.1.
if (PJSIP_URI_SCHEME_IS_SIP(uri))
{
URIClass uri_class = URIClassifier::classify_uri(uri);
pjsip_sip_uri* sip_uri = (pjsip_sip_uri*)uri;
if (uri_class == GLOBAL_PHONE_NUMBER)
{
TRC_DEBUG("Change request URI from SIP URI to tel URI");
req->line.req.uri =
PJUtils::translate_sip_uri_to_tel_uri(sip_uri, pool);
}
}
impu = PJUtils::public_id_from_uri(PJUtils::term_served_user(req));
SAS::Event event(trail(), SASEvent::ICSCF_RCVD_TERM_NON_REG, 0);
event.add_var_param(impu);
event.add_var_param(req->line.req.method.name.slen,
req->line.req.method.name.ptr);
SAS::report_event(event);
}
// Create an LIR router to handle the HSS interactions and S-CSCF
// selection.
_router = (ICSCFRouter*)new ICSCFLIRouter(_icscf->get_hss_connection(),
_icscf->get_scscf_selector(),
trail(),
_acr,
_icscf->port(),
impu,
_originating);
pjsip_sip_uri* scscf_sip_uri = NULL;
// Use the router we just created to query the HSS for an S-CSCF to use.
// TS 32.260 Table 5.2.1.1 says an EVENT ACR should be generated on the
// completion of a Cx query issued in response to a SIP INVITE
bool do_billing = (req->line.req.method.id == PJSIP_INVITE_METHOD);
std::string wildcard;
pjsip_status_code status_code =
(pjsip_status_code)_router->get_scscf(pool,
scscf_sip_uri,
wildcard,
do_billing);
if ((!_originating) && (scscf_not_found(status_code)))
{
TRC_DEBUG("Couldn't find an S-CSCF, attempt to translate the URI");
pjsip_uri* uri = PJUtils::term_served_user(req);
URIClass uri_class = URIClassifier::classify_uri(uri, false);
// For terminating processing, if the HSS indicates that the user does not
// exist, and if the request URI is a tel URI, try an ENUM translation. If
// this succeeds, go back to the HSS. See TS24.229, 5.3.2.1.
//
// Before doing that we should check whether the enforce_user_phone flag is
// set. If it isn't, and we have a numeric SIP URI, it is possible that
// this should have been a tel URI, so translate it and do the HSS lookup
// again. Once again, only do this for global numbers.
if (PJSIP_URI_SCHEME_IS_SIP(uri) && (uri_class == GLOBAL_PHONE_NUMBER))
{
TRC_DEBUG("enforce_user_phone set to false, try using a tel URI");
uri = PJUtils::translate_sip_uri_to_tel_uri((pjsip_sip_uri*)uri, pool);
req->line.req.uri = uri;
// We need to change the IMPU stored on our LIR router so that when
// we do a new LIR we look up the new IMPU.
impu = PJUtils::public_id_from_uri(PJUtils::term_served_user(req));
((ICSCFLIRouter *)_router)->change_impu(impu);
status_code = (pjsip_status_code)_router->get_scscf(pool,
scscf_sip_uri,
wildcard,
do_billing);
}
if (_icscf->_enum_service)
{
// If we still haven't found an S-CSCF, we can now try an ENUM lookup.
// We put this processing in a loop because in theory we may go round
// several times before finding an S-CSCF. In reality this is unlikely
// so we set MAX_ENUM_LOOKUPS to 2.
for (int ii = 0;
(ii < MAX_ENUM_LOOKUPS) && (scscf_not_found(status_code));
++ii)
{
if (PJSIP_URI_SCHEME_IS_TEL(uri))
{
// Do an ENUM lookup and see if we should translate the TEL URI
pjsip_uri* original_req_uri = req->line.req.uri;
_icscf->translate_request_uri(req, get_pool(req), trail());
uri = req->line.req.uri;
URIClass uri_class = URIClassifier::classify_uri(uri, false, true);
std::string rn;
if ((uri_class == NP_DATA) ||
(uri_class == FINAL_NP_DATA))
{
// We got number portability information from ENUM - drop out and route to the BGCF.
route_to_bgcf(req);
return;
}
else if (pjsip_uri_cmp(PJSIP_URI_IN_REQ_URI,
original_req_uri,
req->line.req.uri) != PJ_SUCCESS)
{
// The URI has changed, so make sure we do a LIR lookup on it.
impu = PJUtils::public_id_from_uri(req->line.req.uri);
((ICSCFLIRouter *)_router)->change_impu(impu);
}
// If we successfully translate the req URI and end up with either another TEL URI or a
// local SIP URI, we should look for an S-CSCF again.
if ((uri_class == LOCAL_PHONE_NUMBER) ||
(uri_class == GLOBAL_PHONE_NUMBER) ||
(uri_class == HOME_DOMAIN_SIP_URI))
{
// TEL or local SIP URI. Look up the S-CSCF again.
status_code = (pjsip_status_code)_router->get_scscf(pool,
scscf_sip_uri,
wildcard,
do_billing);
}
else
{
// Number translated to off-switch. Drop out of the loop.
ii = MAX_ENUM_LOOKUPS;
}
}
else
{
// Can't translate the number, skip to the end of the loop.
ii = MAX_ENUM_LOOKUPS;
}
}
}
else
{
// The user is not in the HSS and ENUM is not configured. TS 24.229
// says that, as an alternative to ENUM, we can "forward the request to
// the transit functionality for subsequent routeing". Let's do that
// (currently, we assume the BGCF is the transit functionality, but that
// may be made configurable in future).
TRC_DEBUG("No ENUM service available - outing request directly to transit function (BGCF)");
route_to_bgcf(req);
return;
}
}
URIClass uri_class = URIClassifier::classify_uri(req->line.req.uri);
if (status_code == PJSIP_SC_OK)
{
TRC_DEBUG("Found SCSCF for non-REGISTER");
if (_originating)
{
// Add the `orig` parameter.
pjsip_param* orig_param = PJ_POOL_ALLOC_T(get_pool(req), pjsip_param);
pj_strdup(get_pool(req), &orig_param->name, &STR_ORIG);
orig_param->value.slen = 0;
pj_list_insert_after(&scscf_sip_uri->other_param, orig_param);
}
// Add the P-Profile-Key header here if we've got a wildcard
if (wildcard != "")
{
add_p_profile_header(wildcard, req);
}
PJUtils::add_route_header(req, scscf_sip_uri, get_pool(req));
send_request(req);
}
else if ((uri_class == OFFNET_SIP_URI) ||
(uri_class == GLOBAL_PHONE_NUMBER))
{
// Target is a TEL URI or not in our home domain. Pass to the BGCF.
route_to_bgcf(req);
}
else
{
// Target is in our home domain, but we failed to find an S-CSCF. This is the final response.
pjsip_msg* rsp = create_response(req, status_code);
send_response(rsp);
free_msg(req);
}
}