[Freeswitch-users] B leg ringing when Caller hangup before answer

Fri Feb 20 01:14:06 MSK 2015

Your FXO port connects to an analog telephone line that supplies battery FROM THE OTHER END, typically a central office switch or PBX. This is how telephones have worked for 100 years; there is no extra cost to it. Because it is so common I suggested this as your first method to try since it works well, all you must do is tell your TDM400P to watch for it. (This is a concept similar to the gentleman who is receiving invalid Caller*ID info from the far end switch; it is out of his control and the other end must correct it.)

If that is not available, then try detecting call progress tones coming from the far end of the FXO connection.

If this can’t be done, then there is nothing left to do.

In any case, this has NOTHING to do with SIP. You must detect conditions on the analog line in the analog domain using the equipment connected to that analog telephone line. That is the source of the information that you seek, not in FreeSWITCH and not in SIP.

Bote

From: Charles Wang
Sent: Thursday, 19 February, 2015 13:28
Subject: Re: [Freeswitch-users] B leg ringing when Caller hangup before answer

Hi Bote,

I know the incoming call comes from VOIP Gateway that uses SIP protocol can work well in this scenario. And I don't think it is possible to ask customers to support extra cost in loop battery if I want FS to be a IP-PBX solution with FXS/FXO interfaces on it.

Best regards,

Charles

2015-02-18 4:41 GMT+08:00 Bote Man <bote_radio at botecomm.com>:

Detecting the loop battery interruption is the best way to do it if that is available on the analog line.

Bote

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Charles Wang
Sent: Tuesday, 17 February, 2015 15:06
To: FreeSWITCH Users Help

Subject: Re: [Freeswitch-users] B leg ringing when Caller hangup before answer

Hi all,

I ever try to record the channel of FXO with dahdi_monitor. I can find ring tone and ringback tone in rx and tx when FXO caller is calling FXS or SIP callee. But there is no busy tone when caller hangup the call BEFORE the callee(FXS/SIP) answers it or the call-timeout condition is reached. I think it is correct, isn't it? If it is correct, I can't use busy_detect to handle the disconnect of channels.

Best regards,

Charles

2015-02-18 3:48 GMT+08:00 Charles Wang <lazy.charles at gmail.com>:

Hi Bote,

I use analog card named TDM400P and there are two FXS and two FXO on it. You can find it from this url http://www.ryu.com.tw/image/A400P.jpg. There is a white power outlet behind it.

I am setting it at freetdm.conf and freetdm.conf.xml. But I don't know what loop battery is.

Is there any setting I can use when I try to make a call in <extensions> segement?

Thank you for your reply.

Best regards,

Charles

2015-02-17 16:00 GMT+08:00 Bote Man <bote_radio at botecomm.com>:

It sounds like your originating caller is analog and is not providing supervision signal to indicate to the FXO port that it has released the call, therefore FS continues as if the call is still held active. 

In some configurations the loop battery is interrupted briefly to indicate that the call has been released. In other cases you must detect call progress tones that indicate that the caller is no longer present. In some cases there is no indication provided to the FXO port and only timers and the Leg B will help you.

Bote

From: Charles Wang
Sent: Thursday, 12 February, 2015 11:26
Subject: Re: [Freeswitch-users] B leg ringing when Caller hangup before answer

Hi Brian,

I ever try to answer the A leg in dialplan before bridge to B leg. But the condition is the same.

B leg is still ringing after I hangup the FXO.

I notice that the ringing of B leg will stop if the inbound tdm leg is FXS.

Let me know if you have any suggestion.

Best regards,

Charles

2015-02-12 23:43 GMT+08:00 Brian West <brian at freeswitch.org>:

You may wish to answer that inbound tdm leg before ringing out to the sip device.

On Thu, Feb 12, 2015 at 3:47 AM, Charles Wang <lazy.charles at gmail.com> wrote:

Hi all,

I have a server with freeswitch 1.4.15 + freetdm(FXS/FXO). I think there is a bug in inbound call via the freetdm FXO device.

When I try to make call from FXO and it bridges to SIP device named 1234 via the following dialplan.

 <extension name="my call test">

                <condition field="destination_number" expression="^(1234)$">

                        <action application="set" data="call_timeout=30"/>

                        <action application="bridge" data="user/1234"/>

                 </condition>

   </extension>

Before SIP 1234 answers the call, the caller (FXO) hangup call before 1234 answered. But the callee (SIP 1234) is still ringing and stop ring after about 30 seconds.

It is the same condition if the callee is FXS device.

I can find two channels during ringing (A leg & B leg).

After the caller(FXO) onhook, the A leg is still alive and A leg will not be hangup before the callee (FXS or SIP) stop ring ( call-timeout ).

There are two legs (A leg & B leg) after the caller FXO had hangup.

uuid,direction,created,created_epoch,name,state,cid_name,cid_num,ip_addr,dest,application,application_data,dialplan,context,read_codec,read_rate,read_bit_rate,write_codec,write_rate,write_bit_rate,secure,hostname,presence_id,presence_data,callstate,callee_name,callee_num,callee_direction,call_uuid,sent_callee_name,sent_callee_num,initial_cid_name,initial_cid_num,initial_ip_addr,initial_dest,initial_dialplan,initial_context

53ce4fe9-9511-4625-87ae-1448421c9810,inbound,2015-02-12 17:33:11,1423733591,FreeTDM/2:2/1234,CS_EXECUTE,unknown,unknown,,1234,bridge,freetdm/FXS1/1,XML,TEST,PCMU,8000,64000,PCMU,8000,64000,,charles,,,RINGING,,,,,,,unknown,unknown,,1234,XML,default

cf5a7ee4-cbfd-48e4-ab4e-4d757216712c,outbound,2015-02-12 17:33:12,1423733592,FreeTDM/1:1/,CS_CONSUME_MEDIA,unknown,unknown,,1,,,XML,default,,,,,,,,charles,,,RINGING,Outbound Call,1,,53ce4fe9-9511-4625-87ae-1448421c9810,,,unknown,unknown,,1,XML,default

Can anyone help me to solve it or tell me why?

-- 

Best Regards
Charles

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-- 

Best Regards
Charles

-- 

Best Regards
Charles

_________________________________________________________________________
Professional FreeSWITCH Consulting Services:
consulting at freeswitch.org
http://www.freeswitchsolutions.com

Official FreeSWITCH Sites
http://www.freeswitch.org
http://confluence.freeswitch.org
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-- 

Best Regards
Charles

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