VoIP Mailing List Archives

[john at loopfx.com]

I’m trying to get an attended transfer work with freeSWITCH, but it’s not quite working. I have Microsoft Speech Server on one side and Televantage on the other.

MSS is originating a call, which freeSWITCH is bridging to Televantage. That calls connects just fine. Then, MSS sends a re-INVITE to Televantage to put the call on hold. This works too. Then, MSS originates another call to freeSWITCH, which is again bridged to Televantage. This works fine too.

Then, MSS sends a REFER to freeSWITCH to do the transfer. The transfer should be complete, but there is no audio between the two calls—just silence. I have looked at pcaps and the freeSWITCH logs, but I’m not seeing anything obviously wrong.

After the REFER, I can see audio for both calls going between freeSWITCH and Televantage, so it seems that the only thing missing is freeSWITCH routing the audio from one call to the other call and vice-versa.


Any help would be greatly appreciated. I have a pcap and the freeSWITCH logs, and I can easily reproduce this.

Thanks!
John

[brian at freeswitch.org]

Are you on SVN trunk? If not what rev?

/b

On Dec 8, 2008, at 3:36 PM, John Rutherford wrote:

[john at loopfx.com]

Sorry. I forgot to mention that.

I checked out the trunk last week. I have revision 10597.

John

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Brian West
Sent: Monday, December 08, 2008 4:48 PM
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] No audio after transfer



Are you on SVN trunk? If not what rev?


/b


On Dec 8, 2008, at 3:36 PM, John Rutherford wrote:




Any help would be greatly appreciated. I have a pcap and the freeSWITCH logs, and I can easily reproduce this.



Thanks!

John

[john at loopfx.com]

Sorry to repost, but I haven’t heard anything back on this in a little while.

I checked out the trunk last week. I’m on revision 10597.

Thanks,
John

From: John Rutherford
Sent: Monday, December 08, 2008 4:36 PM
To: freeswitch-users@lists.freeswitch.org
Subject: No audio after transfer



I’m trying to get an attended transfer work with freeSWITCH, but it’s not quite working. I have Microsoft Speech Server on one side and Televantage on the other.

MSS is originating a call, which freeSWITCH is bridging to Televantage. That calls connects just fine. Then, MSS sends a re-INVITE to Televantage to put the call on hold. This works too. Then, MSS originates another call to freeSWITCH, which is again bridged to Televantage. This works fine too.

Then, MSS sends a REFER to freeSWITCH to do the transfer. The transfer should be complete, but there is no audio between the two calls—just silence. I have looked at pcaps and the freeSWITCH logs, but I’m not seeing anything obviously wrong.

After the REFER, I can see audio for both calls going between freeSWITCH and Televantage, so it seems that the only thing missing is freeSWITCH routing the audio from one call to the other call and vice-versa.


Any help would be greatly appreciated. I have a pcap and the freeSWITCH logs, and I can easily reproduce this.

Thanks!
John

[anthony.minessale at g...]

Are you expecting every message that MSS sends FS to be in turn sent to televantage?
That is a proxy behaviour. Since FreeSWITCH plays the role of a b2bua it will not pass the
messages across a bridge.



On Wed, Dec 10, 2008 at 8:36 AM, John Rutherford <john@loopfx.com (john@loopfx.com)> wrote:

[brian at freeswitch.org]

would be most helpful to capture a pcap of the entire thing by itself start to finish.

/b

On Dec 10, 2008, at 11:51 AM, John Rutherford wrote:

[john at loopfx.com]

No. I realize that’s it’s a B2BUA and that’s exactly what we want.

Everything with the transfer seems to work fine, except that there is no audio.

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Anthony Minessale
Sent: Wednesday, December 10, 2008 10:34 AM
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] No audio after transfer


Are you expecting every message that MSS sends FS to be in turn sent to televantage?
That is a proxy behaviour. Since FreeSWITCH plays the role of a b2bua it will not pass the
messages across a bridge.



On Wed, Dec 10, 2008 at 8:36 AM, John Rutherford <john@loopfx.com (john@loopfx.com)> wrote:
Sorry to repost, but I haven't heard anything back on this in a little while.

I checked out the trunk last week. I'm on revision 10597.

Thanks,
John

From: John Rutherford
Sent: Monday, December 08, 2008 4:36 PM
To: freeswitch-users@lists.freeswitch.org (freeswitch-users@lists.freeswitch.org)
Subject: No audio after transfer



I'm trying to get an attended transfer work with freeSWITCH, but it's not quite working. I have Microsoft Speech Server on one side and Televantage on the other.

MSS is originating a call, which freeSWITCH is bridging to Televantage. That calls connects just fine. Then, MSS sends a re-INVITE to Televantage to put the call on hold. This works too. Then, MSS originates another call to freeSWITCH, which is again bridged to Televantage. This works fine too.

Then, MSS sends a REFER to freeSWITCH to do the transfer. The transfer should be complete, but there is no audio between the two calls—just silence. I have looked at pcaps and the freeSWITCH logs, but I'm not seeing anything obviously wrong.

After the REFER, I can see audio for both calls going between freeSWITCH and Televantage, so it seems that the only thing missing is freeSWITCH routing the audio from one call to the other call and vice-versa.


Any help would be greatly appreciated. I have a pcap and the freeSWITCH logs, and I can easily reproduce this.

Thanks!
John



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Anthony Minessale II

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[john at loopfx.com]

I have a pcap, but I’m not able to see anything obviously wrong with it.

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Brian West
Sent: Wednesday, December 10, 2008 12:59 PM
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] No audio after transfer



would be most helpful to capture a pcap of the entire thing by itself start to finish.


/b


On Dec 10, 2008, at 11:51 AM, John Rutherford wrote:




No. I realize that’s it’s a B2BUA and that’s exactly what we want.



Everything with the transfer seems to work fine, except that there is no audio.

[msc at freeswitch.org]

On Wed, Dec 10, 2008 at 10:01 AM, John Rutherford <john@loopfx.com> wrote:

[john at loopfx.com]

I just emailed it to him.

Thanks!

-----Original Message-----
From: freeswitch-users-bounces@lists.freeswitch.org
[mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of
Michael Collins
Sent: Wednesday, December 10, 2008 1:09 PM
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] No audio after transfer

On Wed, Dec 10, 2008 at 10:01 AM, John Rutherford <john@loopfx.com>
wrote:

[intralanman at freeswi...]

try blocking ICMP packets TO the MSS.... i had this exact same problem a few months ago.... MSS starts sending RTP to FS before FS is ready to accept.... so the OS catches the port not open and returns an ICMP 3:3 back to the MSS.... which in turn chokes on the queued up RTP and refuses to send anymore...

-Ray

John Rutherford wrote:

[john at loopfx.com]

Okay. I just tried this.

Now we’re getting the audio going one way, but not the other. So, I can hear the person that I just transferred to, but they can’t hear me.

Anyone have any other ideas?

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Raymond Chandler
Sent: Wednesday, December 10, 2008 3:41 PM
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] No audio after transfer



try blocking ICMP packets TO the MSS.... i had this exact same problem a few months ago.... MSS starts sending RTP to FS before FS is ready to accept.... so the OS catches the port not open and returns an ICMP 3:3 back to the MSS.... which in turn chokes on the queued up RTP and refuses to send anymore...

-Ray

John Rutherford wrote:

[msc at freeswitch.org]

I smell a NAT... is there any NAT involved?

On Wed, Dec 10, 2008 at 2:18 PM, John Rutherford <john@loopfx.com> wrote:

[john at loopfx.com]

No. I wish it were that simple.

I'm doing all of my testing on an internal network.

-----Original Message-----
From: freeswitch-users-bounces@lists.freeswitch.org
[mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of
Michael Collins
Sent: Wednesday, December 10, 2008 5:53 PM
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] No audio after transfer

I smell a NAT... is there any NAT involved?

On Wed, Dec 10, 2008 at 2:18 PM, John Rutherford <john@loopfx.com>
wrote:

[intralanman at freeswi...]

can you send a pcap of sip and rtp with the new problem?

-Ray


John Rutherford wrote: