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skypopen: now answer a call only when directed to do it (before was trying to answer any incoming call). Lot of changes to a messy part, so maybe some problem will come out...

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Signed-off-by: Giovanni Maruzzelli <gmaruzz@gmail.com>
This commit is contained in:
Giovanni Maruzzelli 2010-08-13 16:19:20 -05:00
parent 4861e34bd2
commit 45c6c4d3e4
3 changed files with 256 additions and 30 deletions
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193
src/mod/endpoints/mod_skypopen/mod_skypopen.c
View File

@ -179,6 +179,7 @@ static switch_status_t remove_interface(char *the_interface);
static switch_status_t channel_on_init(switch_core_session_t *session);
static switch_status_t channel_on_hangup(switch_core_session_t *session);
static switch_status_t channel_on_reset(switch_core_session_t *session);
static switch_status_t channel_on_destroy(switch_core_session_t *session);
static switch_status_t channel_on_routing(switch_core_session_t *session);
static switch_status_t channel_on_exchange_media(switch_core_session_t *session);
@ -434,10 +435,6 @@ static switch_status_t channel_on_init(switch_core_session_t *session)
where a destination has been identified. If the channel is simply
left in the initial state, nothing will happen. */
switch_channel_set_state(channel, CS_ROUTING);
switch_mutex_lock(globals.mutex);
globals.calls++;
switch_mutex_unlock(globals.mutex);
DEBUGA_SKYPE("%s CHANNEL INIT %s\n", SKYPOPEN_P_LOG, tech_pvt->name, switch_core_session_get_uuid(session));
return SWITCH_STATUS_SUCCESS;
@ -645,6 +642,29 @@ static switch_status_t channel_on_soft_execute(switch_core_session_t *session)
DEBUGA_SKYPE("%s CHANNEL SOFT_EXECUTE\n", SKYPOPEN_P_LOG, tech_pvt->name);
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t channel_on_reset(switch_core_session_t *session)
{
private_t *tech_pvt = NULL;
switch_channel_t *channel = NULL;
tech_pvt = switch_core_session_get_private(session);
DEBUGA_SKYPE("%s CHANNEL RESET\n", SKYPOPEN_P_LOG, tech_pvt->name);
if (session) {
channel = switch_core_session_get_channel(session);
} else {
ERRORA("No session???\n", SKYPOPEN_P_LOG);
}
if (channel) {
switch_channel_set_state(channel, CS_HANGUP);
} else {
ERRORA("No channel???\n", SKYPOPEN_P_LOG);
}
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t channel_send_dtmf(switch_core_session_t *session, const switch_dtmf_t *dtmf)
{
@ -824,10 +844,14 @@ static switch_status_t channel_write_frame(switch_core_session_t *session, switc
tech_pvt = switch_core_session_get_private(session);
switch_assert(tech_pvt != NULL);
if (!switch_channel_ready(channel) || !switch_test_flag(tech_pvt, TFLAG_IO)) {
if (!switch_channel_ready(channel)) {
ERRORA("channel not ready \n", SKYPOPEN_P_LOG);
return SWITCH_STATUS_FALSE;
}
if (!switch_test_flag(tech_pvt, TFLAG_IO)) {
DEBUGA_SKYPE("channel not in TFLAG_IO \n", SKYPOPEN_P_LOG);
return SWITCH_STATUS_FALSE;
}
#if SWITCH_BYTE_ORDER == __BIG_ENDIAN
if (switch_test_flag(tech_pvt, TFLAG_LINEAR)) {
switch_swap_linear(frame->data, (int) frame->datalen / 2);
@ -865,6 +889,24 @@ static switch_status_t channel_answer_channel(switch_core_session_t *session)
tech_pvt = switch_core_session_get_private(session);
switch_assert(tech_pvt != NULL);
switch_clear_flag(tech_pvt, TFLAG_IO);
skypopen_answer(tech_pvt);
while(!switch_test_flag(tech_pvt, TFLAG_IO)){ //FIXME that would be better with a timeout
if(switch_channel_get_state(channel) == CS_RESET){
return SWITCH_STATUS_FALSE;
}
switch_sleep(5000);
}
switch_mutex_lock(globals.mutex);
globals.calls++;
switch_mutex_unlock(globals.mutex);
DEBUGA_SKYPE("%s CHANNEL ANSWER %s\n", SKYPOPEN_P_LOG, tech_pvt->name, switch_core_session_get_uuid(session));
DEBUGA_SKYPE("ANSWERED! \n", SKYPOPEN_P_LOG);
return SWITCH_STATUS_SUCCESS;
@ -991,7 +1033,7 @@ switch_state_handler_table_t skypopen_state_handlers = {
/*.on_soft_execute */ channel_on_soft_execute,
/*.on_consume_media */ channel_on_consume_media,
/*.on_hibernate */ NULL,
/*.on_reset */ NULL,
/*.on_reset */ channel_on_reset,
/*.on_park */ NULL,
/*.on_reporting */ NULL,
/*.on_destroy */ channel_on_destroy
@ -1184,6 +1226,12 @@ static void *SWITCH_THREAD_FUNC skypopen_signaling_thread_func(switch_thread_t *
*tech_pvt->session_uuid_str = '\0';
*tech_pvt->skype_call_id = '\0';
*tech_pvt->initial_skype_user = '\0';
*tech_pvt->answer_id = '\0';
*tech_pvt->answer_value = '\0';
*tech_pvt->ring_id = '\0';
*tech_pvt->ring_value = '\0';
*tech_pvt->callid_number = '\0';
*tech_pvt->callid_name = '\0';
switch_mutex_unlock(globals.mutex);
switch_sleep(300000); //0.3 sec
@ -1949,7 +1997,6 @@ int new_inbound_channel(private_t * tech_pvt)
}
}
if (channel) {
switch_channel_mark_answered(channel);
switch_channel_set_variable(channel, "skype_user", tech_pvt->skype_user);
switch_channel_set_variable(channel, "initial_skype_user", tech_pvt->initial_skype_user);
}
@ -2261,34 +2308,149 @@ SWITCH_STANDARD_API(skypopen_function)
return SWITCH_STATUS_SUCCESS;
}
int skypopen_answer(private_t * tech_pvt, char *id, char *value)
int skypopen_partner_handle_ring(private_t * tech_pvt)
{
char msg_to_skype[1024];
int i;
int found = 0;
private_t *giovatech;
struct timeval timenow;
char *id = tech_pvt->ring_id;
char *value = tech_pvt->ring_value;
switch_core_session_t *session = NULL;
switch_channel_t *channel = NULL;
switch_mutex_lock(globals.mutex);
//WARNINGA("PARTNER_HANDLE tech_pvt->skype_call_id=%s, tech_pvt->skype_callflow=%d, tech_pvt->interface_state=%d, tech_pvt->skype_user=%s, tech_pvt->callid_number=%s, tech_pvt->ring_value=%s, tech_pvt->ring_id=%s, tech_pvt->answer_value=%s, tech_pvt->answer_id=%s\n", SKYPOPEN_P_LOG, tech_pvt->skype_call_id, tech_pvt->skype_callflow, tech_pvt->interface_state, tech_pvt->skype_user, tech_pvt->callid_number, tech_pvt->ring_value, tech_pvt->ring_id, tech_pvt->answer_value, tech_pvt->answer_id);
gettimeofday(&timenow, NULL);
for (i = 0; !found && i < SKYPOPEN_MAX_INTERFACES; i++) {
if (strlen(globals.SKYPOPEN_INTERFACES[i].name)) {
giovatech = &globals.SKYPOPEN_INTERFACES[i];
if (strlen(giovatech->skype_call_id) && (giovatech->interface_state != SKYPOPEN_STATE_DOWN) && (!strcmp(giovatech->skype_user, tech_pvt->skype_user)) && (!strcmp(giovatech->callid_number, value)) && ((((timenow.tv_sec - giovatech->answer_time.tv_sec) * 1000000) + (timenow.tv_usec - giovatech->answer_time.tv_usec)) < 1000000)) { //XXX 1.5sec - can have a max of 1 call coming from the same skypename to the same skypename each 1.5 seconds
if ((giovatech->interface_state != SKYPOPEN_STATE_DOWN) && (!strcmp(giovatech->skype_user, tech_pvt->skype_user)) && (!strcmp(giovatech->ring_value, value)) && ((((timenow.tv_sec - giovatech->ring_time.tv_sec) * 1000000) + (timenow.tv_usec - giovatech->ring_time.tv_usec)) < 1000000)) { //XXX 1.0sec - can have a max of 1 call coming from the same skypename to the same skypename each 1.0 seconds
found = 1;
DEBUGA_SKYPE
("FOUND (name=%s, giovatech->interface_state=%d != SKYPOPEN_STATE_DOWN) && (giovatech->skype_user=%s == tech_pvt->skype_user=%s) && (giovatech->callid_number=%s == value=%s)\n",
SKYPOPEN_P_LOG, giovatech->name, giovatech->interface_state,
giovatech->skype_user, tech_pvt->skype_user, giovatech->callid_number, value)
if (tech_pvt->interface_state == SKYPOPEN_STATE_PRERING) {
DEBUGA_SKYPE ("FOUND (name=%s, giovatech->interface_state=%d != SKYPOPEN_STATE_DOWN) && (giovatech->skype_user=%s == tech_pvt->skype_user=%s) && (giovatech->callid_number=%s == value=%s)\n", SKYPOPEN_P_LOG, giovatech->name, giovatech->interface_state, giovatech->skype_user, tech_pvt->skype_user, giovatech->callid_number, value);
if (tech_pvt->interface_state == SKYPOPEN_STATE_PRERING) {
tech_pvt->interface_state = SKYPOPEN_STATE_DOWN;
} else if (tech_pvt->interface_state != 0 && tech_pvt->interface_state != SKYPOPEN_STATE_DOWN) {
WARNINGA("Why an interface_state %d HERE?\n", SKYPOPEN_P_LOG, tech_pvt->interface_state);
tech_pvt->interface_state = SKYPOPEN_STATE_DOWN;
}
*tech_pvt->answer_id = '\0';
*tech_pvt->answer_value = '\0';
*tech_pvt->ring_id = '\0';
*tech_pvt->ring_value = '\0';
break;
}
}
}
if (found) {
switch_mutex_unlock(globals.mutex);
return 0;
}
DEBUGA_SKYPE("NOT FOUND\n", SKYPOPEN_P_LOG);
if (tech_pvt && tech_pvt->skype_call_id && !strlen(tech_pvt->skype_call_id)) {
/* we are not inside an active call */
tech_pvt->interface_state = SKYPOPEN_STATE_PRERING;
gettimeofday(&tech_pvt->ring_time, NULL);
switch_copy_string(tech_pvt->callid_number, value, sizeof(tech_pvt->callid_number) - 1);
//WARNINGA("PARTNER_HANDLE_RING tech_pvt->skype_call_id=%s, tech_pvt->skype_callflow=%d, tech_pvt->interface_state=%d, tech_pvt->skype_user=%s, tech_pvt->callid_number=%s, tech_pvt->ring_value=%s, tech_pvt->ring_id=%s, tech_pvt->answer_value=%s, tech_pvt->answer_id=%s\n", SKYPOPEN_P_LOG, tech_pvt->skype_call_id, tech_pvt->skype_callflow, tech_pvt->interface_state, tech_pvt->skype_user, tech_pvt->callid_number, tech_pvt->ring_value, tech_pvt->ring_id, tech_pvt->answer_value, tech_pvt->answer_id);
session = switch_core_session_locate(tech_pvt->session_uuid_str);
if (session) {
switch_core_session_rwunlock(session);
return 0;
}
new_inbound_channel(tech_pvt);
session = switch_core_session_locate(tech_pvt->session_uuid_str);
if (session) {
channel = switch_core_session_get_channel(session);
switch_core_session_queue_indication(session, SWITCH_MESSAGE_INDICATE_RINGING);
if (channel) {
switch_channel_mark_ring_ready(channel);
} else {
ERRORA("no channel\n", SKYPOPEN_P_LOG);
}
switch_core_session_rwunlock(session);
} else {
ERRORA("no session\n", SKYPOPEN_P_LOG);
}
} else if (!tech_pvt || !tech_pvt->skype_call_id) {
ERRORA("No Call ID?\n", SKYPOPEN_P_LOG);
} else {
DEBUGA_SKYPE("We're in a call now (%s), let's refuse this one (%s)\n", SKYPOPEN_P_LOG, tech_pvt->skype_call_id, id);
sprintf(msg_to_skype, "ALTER CALL %s END HANGUP", id);
skypopen_signaling_write(tech_pvt, msg_to_skype);
}
switch_mutex_unlock(globals.mutex);
return 0;
}
int skypopen_answer(private_t * tech_pvt)
{
char msg_to_skype[1024];
int i;
int found = 0;
private_t *giovatech;
struct timeval timenow;
char *id = tech_pvt->answer_id;
char *value = tech_pvt->answer_value;
switch_core_session_t *session = NULL;
switch_channel_t *channel = NULL;
switch_mutex_lock(globals.mutex);
//WARNINGA("ANSWER tech_pvt->skype_call_id=%s, tech_pvt->skype_callflow=%d, tech_pvt->interface_state=%d, tech_pvt->skype_user=%s, tech_pvt->callid_number=%s, tech_pvt->ring_value=%s, tech_pvt->ring_id=%s, tech_pvt->answer_value=%s, tech_pvt->answer_id=%s\n", SKYPOPEN_P_LOG, tech_pvt->skype_call_id, tech_pvt->skype_callflow, tech_pvt->interface_state, tech_pvt->skype_user, tech_pvt->callid_number, tech_pvt->ring_value, tech_pvt->ring_id, tech_pvt->answer_value, tech_pvt->answer_id);
gettimeofday(&timenow, NULL);
for (i = 0; !found && i < SKYPOPEN_MAX_INTERFACES; i++) {
if (strlen(globals.SKYPOPEN_INTERFACES[i].name)) {
giovatech = &globals.SKYPOPEN_INTERFACES[i];
if (strlen(giovatech->skype_call_id) && (giovatech->interface_state != SKYPOPEN_STATE_DOWN) && (!strcmp(giovatech->skype_user, tech_pvt->skype_user)) && (!strcmp(giovatech->callid_number, value)) && ((((timenow.tv_sec - giovatech->answer_time.tv_sec) * 1000000) + (timenow.tv_usec - giovatech->answer_time.tv_usec)) < 1000000)) { //XXX 1.0sec - can have a max of 1 call coming from the same skypename to the same skypename each 1.0 seconds
found = 1;
DEBUGA_SKYPE ("FOUND (name=%s, giovatech->interface_state=%d != SKYPOPEN_STATE_DOWN) && (giovatech->skype_user=%s == tech_pvt->skype_user=%s) && (giovatech->callid_number=%s == value=%s)\n", SKYPOPEN_P_LOG, giovatech->name, giovatech->interface_state, giovatech->skype_user, tech_pvt->skype_user, giovatech->callid_number, value);
if (tech_pvt->interface_state == SKYPOPEN_STATE_PRERING) {
tech_pvt->interface_state = SKYPOPEN_STATE_DOWN;
} else if (tech_pvt->interface_state != 0 && tech_pvt->interface_state != SKYPOPEN_STATE_DOWN) {
WARNINGA("Why an interface_state %d HERE?\n", SKYPOPEN_P_LOG, tech_pvt->interface_state);
tech_pvt->interface_state = SKYPOPEN_STATE_DOWN;
}
if (!zstr(tech_pvt->session_uuid_str)) {
session = switch_core_session_locate(tech_pvt->session_uuid_str);
} else {
ERRORA("No session???\n", SKYPOPEN_P_LOG);
}
if (session) {
channel = switch_core_session_get_channel(session);
} else {
ERRORA("No session???\n", SKYPOPEN_P_LOG);
}
if (channel) {
switch_channel_set_state(channel, CS_RESET);
} else {
ERRORA("No channel???\n", SKYPOPEN_P_LOG);
}
switch_core_session_rwunlock(session);
break;
}
}
@ -2305,9 +2467,6 @@ int skypopen_answer(private_t * tech_pvt, char *id, char *value)
tech_pvt->ib_calls++;
sprintf(msg_to_skype, "GET CALL %s PARTNER_DISPNAME", id);
skypopen_signaling_write(tech_pvt, msg_to_skype);
switch_sleep(10000);
tech_pvt->interface_state = SKYPOPEN_STATE_PREANSWER;
sprintf(msg_to_skype, "ALTER CALL %s ANSWER", id);
skypopen_signaling_write(tech_pvt, msg_to_skype);

11
src/mod/endpoints/mod_skypopen/skypopen.h
View File

@ -264,6 +264,7 @@ struct private_object {
char skype_password[256];
char destination[256];
struct timeval answer_time;
struct timeval ring_time;
struct timeval transfer_time;
char transfer_callid_number[50];
@ -288,6 +289,10 @@ struct private_object {
int silent_mode;
int write_silence_when_idle;
int setsockopt;
char answer_id[256];
char answer_value[256];
char ring_id[256];
char ring_value[256];
};
@ -328,7 +333,8 @@ int skypopen_close_socket(unsigned int fd);
private_t *find_available_skypopen_interface_rr(private_t * tech_pvt_calling);
int remote_party_is_ringing(private_t * tech_pvt);
int remote_party_is_early_media(private_t * tech_pvt);
int skypopen_answer(private_t * tech_pvt, char *id, char *value);
//int skypopen_answer(private_t * tech_pvt, char *id, char *value);
int skypopen_answer(private_t * tech_pvt);
int skypopen_transfer(private_t * tech_pvt, char *id, char *value);
#ifndef WIN32
int skypopen_socket_create_and_bind(private_t * tech_pvt, int *which_port);
@ -337,3 +343,6 @@ int skypopen_socket_create_and_bind(private_t * tech_pvt, unsigned short *which_
#endif //WIN32
int incoming_chatmessage(private_t * tech_pvt, int which);
int next_port(void);
int skypopen_partner_handle_ring(private_t * tech_pvt);
int skypopen_answered(private_t * tech_pvt);
int inbound_channel_answered(private_t * tech_pvt);

82
src/mod/endpoints/mod_skypopen/skypopen_protocol.c
View File

@ -214,7 +214,7 @@ int skypopen_signaling_read(private_t * tech_pvt)
ERRORA("Skype got ERROR: |||%s|||, another call is active on this interface\n\n\n", SKYPOPEN_P_LOG, message);
tech_pvt->interface_state = SKYPOPEN_STATE_ERROR_DOUBLE_CALL;
} else if (!strncasecmp(message, "ERROR 592 ALTER CALL", 19)) {
ERRORA("Skype got ERROR about TRANSFERRING, no problem: |||%s|||\n", SKYPOPEN_P_LOG, message);
NOTICA("Skype got ERROR about TRANSFERRING, no problem: |||%s|||\n", SKYPOPEN_P_LOG, message);
} else if (!strncasecmp(message, "ERROR 559 CALL", 13)) {
if (tech_pvt->interface_state == SKYPOPEN_STATE_PREANSWER) {
DEBUGA_SKYPE("Skype got ERROR about a failed action (probably TRYING to ANSWER A CALL), let's go down: |||%s|||\n", SKYPOPEN_P_LOG,
@ -478,8 +478,12 @@ int skypopen_signaling_read(private_t * tech_pvt)
if (!strcasecmp(prop, "PARTNER_HANDLE")) {
if (tech_pvt->interface_state != SKYPOPEN_STATE_SELECTED && (!strlen(tech_pvt->skype_call_id) || !strlen(tech_pvt->session_uuid_str))) {
/* we are NOT inside an active call */
DEBUGA_SKYPE("Call %s TRY ANSWER\n", SKYPOPEN_P_LOG, id);
skypopen_answer(tech_pvt, id, value);
DEBUGA_SKYPE("Call %s go to skypopen_partner_handle_ring\n", SKYPOPEN_P_LOG, id);
skypopen_strncpy(tech_pvt->ring_id, id, sizeof(tech_pvt->ring_id));
skypopen_strncpy(tech_pvt->ring_value, value, sizeof(tech_pvt->ring_value));
skypopen_strncpy(tech_pvt->answer_id, id, sizeof(tech_pvt->answer_id));
skypopen_strncpy(tech_pvt->answer_value, value, sizeof(tech_pvt->answer_value));
skypopen_partner_handle_ring(tech_pvt);
} else {
/* we are inside an active call */
if (!strcasecmp(tech_pvt->skype_call_id, id)) {
@ -553,7 +557,10 @@ int skypopen_signaling_read(private_t * tech_pvt)
&& (!strlen(tech_pvt->skype_call_id) || !strlen(tech_pvt->session_uuid_str))) {
/* we are NOT inside an active call */
DEBUGA_SKYPE("NO ACTIVE calls in this moment, skype_call %s is RINGING, to ask PARTNER_HANDLE\n", SKYPOPEN_P_LOG, id);
DEBUGA_SKYPE("NO ACTIVE calls in this moment, skype_call %s is RINGING, to ask PARTNER_DISPNAME and PARTNER_HANDLE\n", SKYPOPEN_P_LOG, id);
sprintf(msg_to_skype, "GET CALL %s PARTNER_DISPNAME", id);
skypopen_signaling_write(tech_pvt, msg_to_skype);
skypopen_sleep(100);
sprintf(msg_to_skype, "GET CALL %s PARTNER_HANDLE", id);
skypopen_signaling_write(tech_pvt, msg_to_skype);
skypopen_sleep(10000);
@ -684,14 +691,7 @@ int skypopen_signaling_read(private_t * tech_pvt)
skypopen_signaling_write(tech_pvt, msg_to_skype);
}
tech_pvt->skype_callflow = CALLFLOW_STATUS_INPROGRESS;
if (!strlen(tech_pvt->session_uuid_str)) {
DEBUGA_SKYPE("New Inbound Channel!\n\n\n\n", SKYPOPEN_P_LOG);
new_inbound_channel(tech_pvt);
} else {
tech_pvt->interface_state = SKYPOPEN_STATE_UP;
DEBUGA_SKYPE("Outbound Channel Answered! session_uuid_str=%s\n", SKYPOPEN_P_LOG, tech_pvt->session_uuid_str);
outbound_channel_answered(tech_pvt);
}
skypopen_answered(tech_pvt);
} else {
DEBUGA_SKYPE("I'm on %s, skype_call %s is NOT MY call, ignoring\n", SKYPOPEN_P_LOG, tech_pvt->skype_call_id, id);
}
@ -1752,3 +1752,61 @@ while(XPending(disp)){
}
#endif // WIN32
int inbound_channel_answered(private_t * tech_pvt)
{
int res = 0;
switch_core_session_t *session = NULL;
switch_channel_t *channel = NULL;
session = switch_core_session_locate(tech_pvt->session_uuid_str);
if (session) {
channel = switch_core_session_get_channel(session);
if (channel) {
switch_set_flag(tech_pvt, TFLAG_IO);
} else {
ERRORA("no channel\n", SKYPOPEN_P_LOG);
}
switch_core_session_rwunlock(session);
} else {
ERRORA("no session\n", SKYPOPEN_P_LOG);
}
return res;
}
int skypopen_answered(private_t * tech_pvt)
{
int res = 0;
switch_core_session_t *session = NULL;
switch_channel_t *channel = NULL;
//WARNINGA("ANSWERED tech_pvt->skype_call_id=%s, tech_pvt->skype_callflow=%d, tech_pvt->interface_state=%d, tech_pvt->skype_user=%s, tech_pvt->callid_number=%s, tech_pvt->ring_value=%s, tech_pvt->ring_id=%s, tech_pvt->answer_value=%s, tech_pvt->answer_id=%s\n", SKYPOPEN_P_LOG, tech_pvt->skype_call_id, tech_pvt->skype_callflow, tech_pvt->interface_state, tech_pvt->skype_user, tech_pvt->callid_number, tech_pvt->ring_value, tech_pvt->ring_id, tech_pvt->answer_value, tech_pvt->answer_id);
session = switch_core_session_locate(tech_pvt->session_uuid_str);
if (session) {
channel = switch_core_session_get_channel(session);
if (channel) {
if (switch_channel_direction(channel) == SWITCH_CALL_DIRECTION_OUTBOUND) {
tech_pvt->interface_state = SKYPOPEN_STATE_UP;
DEBUGA_SKYPE("Outbound Channel Answered! session_uuid_str=%s\n", SKYPOPEN_P_LOG, tech_pvt->session_uuid_str);
outbound_channel_answered(tech_pvt);
} else {
DEBUGA_SKYPE("answered Inbound Channel!\n\n\n\n", SKYPOPEN_P_LOG);
inbound_channel_answered(tech_pvt);
}
} else {
ERRORA("no channel\n", SKYPOPEN_P_LOG);
}
switch_core_session_rwunlock(session);
} else {
ERRORA("no session\n", SKYPOPEN_P_LOG);
}
return res;
}