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pull srtp negotiation stuff into the core stage 1

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This commit is contained in:
Anthony Minessale committed 2013-03-31 21:27:13 -05:00
1 parent 330f68d946
commit 0a246d1cb4
8 files changed
+323 -208
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src/mod/endpoints/mod_sofia/mod_sofia.c
+2 -11
View File
@@ -93,17 +93,8 @@ static switch_status_t sofia_on_init(switch_core_session_t *session)
}
if (sofia_test_flag(tech_pvt, TFLAG_OUTBOUND) || switch_channel_test_flag(tech_pvt->channel, CF_RECOVERING)) {
const char *var;
if ((var = switch_channel_get_variable(channel, SOFIA_SECURE_MEDIA_VARIABLE)) && !zstr(var)) {
if (switch_true(var) || !strcasecmp(var, SWITCH_RTP_CRYPTO_KEY_32)) {
sofia_set_flag_locked(tech_pvt, TFLAG_SECURE);
sofia_glue_build_crypto(tech_pvt, 1, AES_CM_128_HMAC_SHA1_32, SWITCH_RTP_CRYPTO_SEND);
} else if (!strcasecmp(var, SWITCH_RTP_CRYPTO_KEY_80)) {
sofia_set_flag_locked(tech_pvt, TFLAG_SECURE);
sofia_glue_build_crypto(tech_pvt, 1, AES_CM_128_HMAC_SHA1_80, SWITCH_RTP_CRYPTO_SEND);
}
}
switch_core_session_check_outgoing_crypto(session, SOFIA_SECURE_MEDIA_VARIABLE);
if (sofia_glue_do_invite(session) != SWITCH_STATUS_SUCCESS) {
@@ -1871,7 +1862,7 @@ static switch_status_t sofia_receive_message(switch_core_session_t *session, swi
if ((var = switch_channel_get_variable(channel, SOFIA_SECURE_MEDIA_VARIABLE)) &&
(switch_true(var) || !strcasecmp(var, SWITCH_RTP_CRYPTO_KEY_32) || !strcasecmp(var, SWITCH_RTP_CRYPTO_KEY_80))) {
sofia_set_flag_locked(tech_pvt, TFLAG_SECURE);
switch_channel_set_flag(tech_pvt->channel, CF_SECURE);
}
if (sofia_test_pflag(tech_pvt->profile, PFLAG_AUTOFIX_TIMING)) {
src/mod/endpoints/mod_sofia/mod_sofia.h
+1 -12
View File
@@ -224,7 +224,6 @@ typedef enum {
PFLAG_RECIEVED_IN_NAT_REG_CONTACT,
PFLAG_3PCC,
PFLAG_DISABLE_RTP_AUTOADJ,
PFLAG_DISABLE_SRTP_AUTH,
PFLAG_FUNNY_STUN,
PFLAG_STUN_ENABLED,
PFLAG_STUN_AUTO_DISABLE,
@@ -309,7 +308,6 @@ typedef enum {
TFLAG_BYE,
TFLAG_ANS,
TFLAG_EARLY_MEDIA,
TFLAG_SECURE,
TFLAG_VAD_IN,
TFLAG_VAD_OUT,
TFLAG_VAD,
@@ -349,7 +347,6 @@ typedef enum {
TFLAG_SLA_BARGE,
TFLAG_SLA_BARGING,
TFLAG_PASS_ACK,
TFLAG_CRYPTO_RECOVER,
TFLAG_DROP_DTMF,
/* No new flags below this line */
TFLAG_MAX
@@ -754,12 +751,6 @@ struct private_object {
char *rm_fmtp;
char *fmtp_out;
char *remote_sdp_str;
int crypto_tag;
unsigned char local_raw_key[SWITCH_RTP_MAX_CRYPTO_LEN];
unsigned char remote_raw_key[SWITCH_RTP_MAX_CRYPTO_LEN];
switch_rtp_crypto_key_type_t crypto_send_type;
switch_rtp_crypto_key_type_t crypto_recv_type;
switch_rtp_crypto_key_type_t crypto_type;
char *early_sdp;
char *local_sdp_str;
char *last_sdp_str;
@@ -777,8 +768,6 @@ struct private_object {
char *invite_contact;
char *local_url;
char *gateway_name;
char *local_crypto_key;
char *remote_crypto_key;
char *record_route;
char *extrtpip;
char *stun_ip;
@@ -1125,7 +1114,7 @@ char *sofia_glue_strip_uri(const char *str);
int sofia_glue_check_nat(sofia_profile_t *profile, const char *network_ip);
int sofia_glue_transport_has_tls(const sofia_transport_t tp);
const char *sofia_glue_get_unknown_header(sip_t const *sip, const char *name);
switch_status_t sofia_glue_build_crypto(private_object_t *tech_pvt, int index, switch_rtp_crypto_key_type_t type, switch_rtp_crypto_direction_t direction);
switch_status_t sofia_media_build_crypto(private_object_t *tech_pvt, int index, switch_rtp_crypto_key_type_t type, switch_rtp_crypto_direction_t direction);
void sofia_glue_tech_patch_sdp(private_object_t *tech_pvt);
switch_status_t sofia_glue_tech_proxy_remote_addr(private_object_t *tech_pvt, const char *sdp_str);
void sofia_presence_event_thread_start(void);
src/mod/endpoints/mod_sofia/sofia.c
+3 -2
View File
@@ -3923,7 +3923,7 @@ switch_status_t config_sofia(sofia_config_t reload, char *profile_name)
} else if (!strcasecmp(var, "disable-rtp-auto-adjust") && switch_true(val)) {
sofia_set_pflag(profile, PFLAG_DISABLE_RTP_AUTOADJ);
} else if (!strcasecmp(var, "NDLB-support-asterisk-missing-srtp-auth") && switch_true(val)) {
sofia_set_pflag(profile, PFLAG_DISABLE_SRTP_AUTH);
profile->ndlb |= SM_NDLB_DISABLE_SRTP_AUTH;
} else if (!strcasecmp(var, "NDLB-funny-stun")) {
if (switch_true(val)) {
sofia_set_pflag(profile, PFLAG_FUNNY_STUN);
@@ -6187,7 +6187,8 @@ static void sofia_handle_sip_i_state(switch_core_session_t *session, int status,
if (is_ok) {
if (tech_pvt->local_crypto_key) {
if (switch_core_sesson_local_crypto_key(tech_pvt->session, SWITCH_MEDIA_TYPE_AUDIO)) {
sofia_glue_set_local_sdp(tech_pvt, NULL, 0, NULL, 0);
}
if (sofia_use_soa(tech_pvt)) {
src/mod/endpoints/mod_sofia/sofia_glue.c
+11 -56
View File
@@ -186,6 +186,7 @@ static void generate_m(private_object_t *tech_pvt, char *buf, size_t buflen,
int rate;
int already_did[128] = { 0 };
int ptime = 0, noptime = 0;
const char *local_audio_crypto_key = switch_core_sesson_local_crypto_key(tech_pvt->session, SWITCH_MEDIA_TYPE_AUDIO);
switch_snprintf(buf + strlen(buf), buflen - strlen(buf), "m=audio %d RTP/%sAVP",
port, secure ? "S" : "");
@@ -323,7 +324,7 @@ static void generate_m(private_object_t *tech_pvt, char *buf, size_t buflen,
}
if (secure) {
switch_snprintf(buf + strlen(buf), buflen - strlen(buf), "a=crypto:%s\n", tech_pvt->local_crypto_key);
switch_snprintf(buf + strlen(buf), buflen - strlen(buf), "a=crypto:%s\n", local_audio_crypto_key);
//switch_snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "a=encryption:optional\n");
}
@@ -395,7 +396,8 @@ void sofia_glue_set_local_sdp(private_object_t *tech_pvt, const char *ip, switch
switch_event_t *map = NULL, *ptmap = NULL;
const char *b_sdp = NULL;
int verbose_sdp = 0;
const char *local_audio_crypto_key = switch_core_sesson_local_crypto_key(tech_pvt->session, SWITCH_MEDIA_TYPE_AUDIO);
switch_zmalloc(buf, SDPBUFLEN);
sofia_glue_check_dtmf_type(tech_pvt);
@@ -513,7 +515,7 @@ void sofia_glue_set_local_sdp(private_object_t *tech_pvt, const char *ip, switch
if (tech_pvt->rm_encoding) {
switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "m=audio %d RTP/%sAVP",
port, (!zstr(tech_pvt->local_crypto_key) && sofia_test_flag(tech_pvt, TFLAG_SECURE)) ? "S" : "");
port, (!zstr(local_audio_crypto_key) && switch_channel_test_flag(tech_pvt->channel, CF_SECURE)) ? "S" : "");
switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), " %d", tech_pvt->pt);
@@ -571,8 +573,8 @@ void sofia_glue_set_local_sdp(private_object_t *tech_pvt, const char *ip, switch
switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=%s\n", sr);
}
if (!zstr(tech_pvt->local_crypto_key) && sofia_test_flag(tech_pvt, TFLAG_SECURE)) {
switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=crypto:%s\n", tech_pvt->local_crypto_key);
if (!zstr(local_audio_crypto_key) && switch_channel_test_flag(tech_pvt->channel, CF_SECURE)) {
switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=crypto:%s\n", local_audio_crypto_key);
//switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=encryption:optional\n");
}
@@ -595,7 +597,7 @@ void sofia_glue_set_local_sdp(private_object_t *tech_pvt, const char *ip, switch
char *bp = buf;
int both = 1;
if ((!zstr(tech_pvt->local_crypto_key) && sofia_test_flag(tech_pvt, TFLAG_SECURE))) {
if ((!zstr(local_audio_crypto_key) && switch_channel_test_flag(tech_pvt->channel, CF_SECURE))) {
generate_m(tech_pvt, buf, SDPBUFLEN, port, 0, append_audio, sr, use_cng, cng_type, map, verbose_sdp, 1);
bp = (buf + strlen(buf));
@@ -631,7 +633,7 @@ void sofia_glue_set_local_sdp(private_object_t *tech_pvt, const char *ip, switch
cur_ptime = this_ptime;
if ((!zstr(tech_pvt->local_crypto_key) && sofia_test_flag(tech_pvt, TFLAG_SECURE))) {
if ((!zstr(local_audio_crypto_key) && switch_channel_test_flag(tech_pvt->channel, CF_SECURE))) {
generate_m(tech_pvt, bp, SDPBUFLEN - strlen(buf), port, cur_ptime, append_audio, sr, use_cng, cng_type, map, verbose_sdp, 1);
bp = (buf + strlen(buf));
@@ -3109,51 +3111,6 @@ switch_status_t sofia_glue_tech_set_codec(private_object_t *tech_pvt, int force)
}
switch_status_t sofia_glue_build_crypto(private_object_t *tech_pvt, int index, switch_rtp_crypto_key_type_t type, switch_rtp_crypto_direction_t direction)
{
unsigned char b64_key[512] = "";
const char *type_str;
unsigned char *key;
const char *val;
char *p;
if (type == AES_CM_128_HMAC_SHA1_80) {
type_str = SWITCH_RTP_CRYPTO_KEY_80;
} else {
type_str = SWITCH_RTP_CRYPTO_KEY_32;
}
if (direction == SWITCH_RTP_CRYPTO_SEND) {
key = tech_pvt->local_raw_key;
} else {
key = tech_pvt->remote_raw_key;
}
switch_rtp_get_random(key, SWITCH_RTP_KEY_LEN);
switch_b64_encode(key, SWITCH_RTP_KEY_LEN, b64_key, sizeof(b64_key));
p = strrchr((char *) b64_key, '=');
while (p && *p && *p == '=') {
*p-- = '\0';
}
tech_pvt->local_crypto_key = switch_core_session_sprintf(tech_pvt->session, "%d %s inline:%s", index, type_str, b64_key);
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(tech_pvt->session), SWITCH_LOG_DEBUG, "Set Local Key [%s]\n", tech_pvt->local_crypto_key);
if (!sofia_test_pflag(tech_pvt->profile, PFLAG_DISABLE_SRTP_AUTH) &&
!((val = switch_channel_get_variable(tech_pvt->channel, "NDLB_support_asterisk_missing_srtp_auth")) && switch_true(val))) {
tech_pvt->crypto_type = type;
} else {
tech_pvt->crypto_type = AES_CM_128_NULL_AUTH;
}
return SWITCH_STATUS_SUCCESS;
}
static void add_audio_codec(sdp_rtpmap_t *map, int ptime, char *buf, switch_size_t buflen)
{
int codec_ms = ptime;
@@ -4131,10 +4088,8 @@ int sofia_recover_callback(switch_core_session_t *session)
sofia_glue_attach_private(session, profile, tech_pvt, NULL);
switch_channel_set_name(tech_pvt->channel, switch_channel_get_variable(channel, "channel_name"));
if ((tmp = switch_channel_get_variable(channel, "srtp_remote_audio_crypto_key"))) {
tech_pvt->remote_crypto_key = switch_core_session_strdup(session, tmp);
sofia_set_flag(tech_pvt, TFLAG_CRYPTO_RECOVER);
}
switch_core_session_get_recovery_crypto_key(session, SWITCH_MEDIA_TYPE_AUDIO, "srtp_remote_audio_crypto_key");
if ((tmp = switch_channel_get_variable(channel, "sip_local_sdp_str"))) {
tech_pvt->local_sdp_str = switch_core_session_strdup(session, tmp);
src/mod/endpoints/mod_sofia/sofia_media.c
+8 -125
View File
@@ -311,61 +311,6 @@ switch_t38_options_t *sofia_glue_extract_t38_options(switch_core_session_t *sess
}
switch_status_t sofia_glue_add_crypto(private_object_t *tech_pvt, const char *key_str, switch_rtp_crypto_direction_t direction)
{
unsigned char key[SWITCH_RTP_MAX_CRYPTO_LEN];
switch_rtp_crypto_key_type_t type;
char *p;
if (!switch_rtp_ready(tech_pvt->rtp_session)) {
goto bad;
}
p = strchr(key_str, ' ');
if (p && *p && *(p + 1)) {
p++;
if (!strncasecmp(p, SWITCH_RTP_CRYPTO_KEY_32, strlen(SWITCH_RTP_CRYPTO_KEY_32))) {
type = AES_CM_128_HMAC_SHA1_32;
} else if (!strncasecmp(p, SWITCH_RTP_CRYPTO_KEY_80, strlen(SWITCH_RTP_CRYPTO_KEY_80))) {
type = AES_CM_128_HMAC_SHA1_80;
} else {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(tech_pvt->session), SWITCH_LOG_ERROR, "Parse Error near [%s]\n", p);
goto bad;
}
p = strchr(p, ' ');
if (p && *p && *(p + 1)) {
p++;
if (strncasecmp(p, "inline:", 7)) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(tech_pvt->session), SWITCH_LOG_ERROR, "Parse Error near [%s]\n", p);
goto bad;
}
p += 7;
switch_b64_decode(p, (char *) key, sizeof(key));
if (direction == SWITCH_RTP_CRYPTO_SEND) {
tech_pvt->crypto_send_type = type;
memcpy(tech_pvt->local_raw_key, key, SWITCH_RTP_KEY_LEN);
} else {
tech_pvt->crypto_recv_type = type;
memcpy(tech_pvt->remote_raw_key, key, SWITCH_RTP_KEY_LEN);
}
return SWITCH_STATUS_SUCCESS;
}
}
bad:
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(tech_pvt->session), SWITCH_LOG_ERROR, "Error!\n");
return SWITCH_STATUS_FALSE;
}
uint8_t sofia_glue_negotiate_sdp(switch_core_session_t *session, const char *r_sdp)
{
@@ -676,67 +621,9 @@ uint8_t sofia_glue_negotiate_sdp(switch_core_session_t *session, const char *r_s
crypto = attr->a_value;
crypto_tag = atoi(crypto);
if (tech_pvt->remote_crypto_key && switch_rtp_ready(tech_pvt->rtp_session)) {
/* Compare all the key. The tag may remain the same even if key changed */
if (crypto && !strcmp(crypto, tech_pvt->remote_crypto_key)) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Existing key is still valid.\n");
} else {
const char *a = switch_stristr("AES", tech_pvt->remote_crypto_key);
const char *b = switch_stristr("AES", crypto);
got_crypto = switch_core_session_check_incoming_crypto(tech_pvt->session,
SOFIA_HAS_CRYPTO_VARIABLE, SWITCH_MEDIA_TYPE_AUDIO, crypto, crypto_tag);
/* Change our key every time we can */
if (sofia_test_flag(tech_pvt, TFLAG_CRYPTO_RECOVER)) {
sofia_clear_flag(tech_pvt, TFLAG_CRYPTO_RECOVER);
} else if (switch_stristr(SWITCH_RTP_CRYPTO_KEY_32, crypto)) {
switch_channel_set_variable(tech_pvt->channel, SOFIA_HAS_CRYPTO_VARIABLE, SWITCH_RTP_CRYPTO_KEY_32);
sofia_glue_build_crypto(tech_pvt, atoi(crypto), AES_CM_128_HMAC_SHA1_32, SWITCH_RTP_CRYPTO_SEND);
switch_rtp_add_crypto_key(tech_pvt->rtp_session, SWITCH_RTP_CRYPTO_SEND, atoi(crypto), tech_pvt->crypto_type,
tech_pvt->local_raw_key, SWITCH_RTP_KEY_LEN);
} else if (switch_stristr(SWITCH_RTP_CRYPTO_KEY_80, crypto)) {
switch_channel_set_variable(tech_pvt->channel, SOFIA_HAS_CRYPTO_VARIABLE, SWITCH_RTP_CRYPTO_KEY_80);
sofia_glue_build_crypto(tech_pvt, atoi(crypto), AES_CM_128_HMAC_SHA1_80, SWITCH_RTP_CRYPTO_SEND);
switch_rtp_add_crypto_key(tech_pvt->rtp_session, SWITCH_RTP_CRYPTO_SEND, atoi(crypto), tech_pvt->crypto_type,
tech_pvt->local_raw_key, SWITCH_RTP_KEY_LEN);
} else {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Crypto Setup Failed!.\n");
}
if (a && b && !strncasecmp(a, b, 23)) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Change Remote key to [%s]\n", crypto);
tech_pvt->remote_crypto_key = switch_core_session_strdup(tech_pvt->session, crypto);
switch_channel_set_variable(tech_pvt->channel, "srtp_remote_audio_crypto_key", crypto);
tech_pvt->crypto_tag = crypto_tag;
if (switch_rtp_ready(tech_pvt->rtp_session) && sofia_test_flag(tech_pvt, TFLAG_SECURE)) {
sofia_glue_add_crypto(tech_pvt, tech_pvt->remote_crypto_key, SWITCH_RTP_CRYPTO_RECV);
switch_rtp_add_crypto_key(tech_pvt->rtp_session, SWITCH_RTP_CRYPTO_RECV, tech_pvt->crypto_tag,
tech_pvt->crypto_type, tech_pvt->remote_raw_key, SWITCH_RTP_KEY_LEN);
}
got_crypto++;
} else {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Ignoring unacceptable key\n");
}
}
} else if (!switch_rtp_ready(tech_pvt->rtp_session)) {
tech_pvt->remote_crypto_key = switch_core_session_strdup(tech_pvt->session, crypto);
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Set Remote Key [%s]\n", tech_pvt->remote_crypto_key);
switch_channel_set_variable(tech_pvt->channel, "srtp_remote_audio_crypto_key", crypto);
tech_pvt->crypto_tag = crypto_tag;
got_crypto++;
if (zstr(tech_pvt->local_crypto_key)) {
if (switch_stristr(SWITCH_RTP_CRYPTO_KEY_32, crypto)) {
switch_channel_set_variable(tech_pvt->channel, SOFIA_HAS_CRYPTO_VARIABLE, SWITCH_RTP_CRYPTO_KEY_32);
sofia_glue_build_crypto(tech_pvt, atoi(crypto), AES_CM_128_HMAC_SHA1_32, SWITCH_RTP_CRYPTO_SEND);
} else if (switch_stristr(SWITCH_RTP_CRYPTO_KEY_80, crypto)) {
switch_channel_set_variable(tech_pvt->channel, SOFIA_HAS_CRYPTO_VARIABLE, SWITCH_RTP_CRYPTO_KEY_80);
sofia_glue_build_crypto(tech_pvt, atoi(crypto), AES_CM_128_HMAC_SHA1_80, SWITCH_RTP_CRYPTO_SEND);
} else {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Crypto Setup Failed!.\n");
}
}
}
}
}
@@ -1171,7 +1058,7 @@ switch_status_t sofia_media_activate_rtp(private_object_t *tech_pvt)
}
if ((var = switch_channel_get_variable(tech_pvt->channel, SOFIA_SECURE_MEDIA_VARIABLE)) && switch_true(var)) {
sofia_set_flag_locked(tech_pvt, TFLAG_SECURE);
switch_channel_set_flag(tech_pvt->channel, CF_SECURE);
}
if (switch_channel_test_flag(tech_pvt->channel, CF_PROXY_MODE)) {
@@ -1376,6 +1263,9 @@ switch_status_t sofia_media_activate_rtp(private_object_t *tech_pvt)
uint32_t stun_ping = 0;
const char *ssrc;
switch_core_media_set_rtp_session(tech_pvt->session, SWITCH_MEDIA_TYPE_AUDIO, tech_pvt->rtp_session);
if ((ssrc = switch_channel_get_variable(tech_pvt->channel, "rtp_use_ssrc"))) {
uint32_t ssrc_ul = (uint32_t) strtoul(ssrc, NULL, 10);
switch_rtp_set_ssrc(tech_pvt->rtp_session, ssrc_ul);
@@ -1582,15 +1472,7 @@ switch_status_t sofia_media_activate_rtp(private_object_t *tech_pvt)
switch_rtp_set_cng_pt(tech_pvt->rtp_session, tech_pvt->cng_pt);
}
if (tech_pvt->remote_crypto_key && sofia_test_flag(tech_pvt, TFLAG_SECURE)) {
sofia_glue_add_crypto(tech_pvt, tech_pvt->remote_crypto_key, SWITCH_RTP_CRYPTO_RECV);
switch_rtp_add_crypto_key(tech_pvt->rtp_session, SWITCH_RTP_CRYPTO_SEND, 1, tech_pvt->crypto_type, tech_pvt->local_raw_key,
SWITCH_RTP_KEY_LEN);
switch_rtp_add_crypto_key(tech_pvt->rtp_session, SWITCH_RTP_CRYPTO_RECV, tech_pvt->crypto_tag, tech_pvt->crypto_type, tech_pvt->remote_raw_key,
SWITCH_RTP_KEY_LEN);
switch_channel_set_variable(tech_pvt->channel, SOFIA_SECURE_MEDIA_CONFIRMED_VARIABLE, "true");
}
switch_core_session_apply_crypto(tech_pvt->session, SWITCH_MEDIA_TYPE_AUDIO, SOFIA_SECURE_MEDIA_CONFIRMED_VARIABLE);
switch_snprintf(tmp, sizeof(tmp), "%d", tech_pvt->remote_sdp_audio_port);
switch_channel_set_variable(tech_pvt->channel, SWITCH_REMOTE_MEDIA_IP_VARIABLE, tech_pvt->remote_sdp_audio_ip);
@@ -1754,6 +1636,7 @@ switch_status_t sofia_media_activate_rtp(private_object_t *tech_pvt)
if (switch_rtp_ready(tech_pvt->video_rtp_session)) {
switch_rtp_set_default_payload(tech_pvt->video_rtp_session, tech_pvt->video_agreed_pt);
switch_core_media_set_rtp_session(tech_pvt->session, SWITCH_MEDIA_TYPE_VIDEO, tech_pvt->video_rtp_session);
}
if (switch_rtp_ready(tech_pvt->video_rtp_session)) {