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BT200 attended transfer

marconicolazzo
Posts: 4
 Member Since:
2007-09-01
Submitted by marconicolazzo on Wed, 12/12/2007 - 6:41am.

I've a network with 10 GrandStream BT200 phones - firmware version 1.1.5.15 - and a Trixbox 2.2.4 (asterisk 1.2.23 & FreePBX 2.2.3)

I've a problem with the attended transfer procedure: this is the most frequent behaviour:

A (from an external SIP trunk, eventually) calls B
B put the call with A on hold - using Flash button
B calls C
C answers the call and speaks with B
B presses transfer

Now B gets disconnected as expected, C can hear A, but A cannot hear C: A keep on hearing the music-on-hold.
To re-establish the full duplex connection between A and C, C can put on hold the call and get it back again using the Hold button.
This is very annoying for my users!

I've tested several firmware version until now ( 1.1.4.17-18-20-22-25,1.1.5.10-15) but none of them fixed the problem!
I've even tested the network using another PBX based on asterisk 1.4.15. In this configuration if A is a local extension the transfer seems to be handled correctly (but I made only limited testing). When A is a call from an external trunk, the behaviour is the same: A keeps hearing the music after the completion of the transfer.

Thanks

Ing. Marco Nicolazzo
NIVA Servizi Informatici srl

‹ Dynamic Phonebook for GXP-2000 BLF/presence combined ›

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marconicolazzo
Posts: 4
 Member Since:
2007-09-01
Anyone with a working attended transfer on BT200?
Thu, 12/13/2007 - 8:40am

Does anyone have an installation with GrandStream BT200 and is able to use reliably the attended transfer feature?

I mean:

A calls B
B answers the call from A
B press flash tu put A on hold -> A hears music on hold
B calls C (dialing extension number+send)
C answers the call from B and speaks to B
B presses transfer and hangs up

At this point, in my installation:
C hears A
A hears music on hold

Now, by pressing the hold button twice, C can re-establish the full duplex communication with A.

Is there anyone who has an installation where all this procedure work properly? i.e. A can hear C after the transfer?

Thanks!


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biquad
Posts: 37
 Member Since:
2006-11-11
Hi Marco, In case you
Sun, 01/06/2008 - 8:34am

Hi Marco,

In case you haven't noticed before, "Grandstream so' 'na m*". See www.grandstreamsucks.com et al.

In any case, yes I know of transfer issues with BT200's. Unfortunately, it's on a system I don't administer anymore, so the problem is still there without any possibility of further investigation or testing with upgrades in Trixbox and/or firmware.

I believe the problem you are experiencing is very similar to what I posted here:

http://www.trixbox.org/forums/vendor-moderated-forums/grandstream...

Grandstream, by the way, *never* *ever* replied to my emails. I have tcpdumps available to be analyzed, but nobody cares.


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nricciardi
Posts: 94
 Member Since:
2006-08-26
Same here
Thu, 02/28/2008 - 8:45pm

Grandstream is junk.

Period.

NR

--

NR


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Zhadnost
Posts: 34
 Member Since:
2007-10-08
I don't give a shit if it's
Sat, 03/01/2008 - 3:03am

I don't give a shit if it's your time of the month, there's no reason to take it out on a reasonable embedded-systems provider.


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aca
Posts: 10
 Member Since:
2007-06-12
I have the same problem,
Mon, 03/03/2008 - 7:50am

I have the same problem, with attended transfers, the guys from GS tried to help me but no luck. I have some BT200 with old FW version 1.1.1.14 and ATT works ok, but that FW had other problems echo..etc. I searched for solutions on the net, tried different FW combinations, but nothing seams to work.
I am slowly moving to Linksys phones because of that. And one more thing the heandset is heating to much.
If you find any solution please post it.


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vitrinho
Posts: 2
 Member Since:
2008-04-14
This configuration works OK
Wed, 07/23/2008 - 8:53am

BT200:

MAC Address: 00:0B:82:0B:C0:EB
IP Address: 192.168.0.123
Product Model: BT200 (HW1.1A)
Part Number: N/A
Software Version: Program-- 1.1.6.16 Bootloader-- 1.1.6.5
System Up Time: 0 day(s) 0 hour(s) 4 minute(s)
System Time 17:44
Wednesday, 23 July, 2008
Registered: Yes
PPPoE Link Up: disabled

Trixbox:

Kernel Version 2.6.18-53.1.4.el5 (SMP)
Distro Name CentOS release 5 (Final)
Asterisk 1.4.19-1 RPM
Trixbox CE 2.6.1

Normal Transfer:

TRANSF + ext + SEND

Attended Transfer:

FLASH + ext + SEND --> TRANSFER (to complete)


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