Bindtransfer not working on wifi phones

[Arturo J Garcia Jmz]

I have a setup sipxcom sipXcom 17.08.20170803044127  with wifi grandstream phones wp810 

Calls and assisted transfer works ok, but if I do try blind transfer the target phone can not pick up the call ( buttons are not responsive)

Someone has some clue about it?

[Nathaniel Watkins]

Likely unrelated, but I had similar issues on a Poly D230 wireless. I had to downgrade the firmware to get call transfers working again.

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[Arturo J Garcia Jmz]

I just find there is a setting on the phone configuration in :

"Account / Call Settings" -  "Transfer on Conference Hangup : No OR Yes", by default is set to NO,  I just changed the value to YES and the blind transfer it is working now

[Arturo J Garcia Jmz]

I have to say , the problem persist, what I realized I fixed when there is a conference, if the originator hang up the conference does not end.

But I noticed the blind transfer does not work at all neither in desktop phones, on any case when the call is transfered, the destinator is not able to take the call "seem the keyboard is kind of frozen and none key is "funtional" to take the call!

Any suggestion?

[Arturo J Garcia Jmz]

I just dig a little bit more with sngrep

And found  : SIP/2.0 481 Call Leg/Transaction Does Not Exist, when the call is transfered, what that means?

There is a Bye event fist

BYE sip:8...@172.16.51.113:5060 SIP/2.0
Via: SIP/2.0/UDP 172.16.1.10;branch-z9hG4bK-xx-b597F7FK30V7ak* h
Via: SIP/2.0/UDP 172.16.51.109:20830;branch=z9hG4bK1286403075;port=20830
From: <sip:8...@172.16.1.10;X-sipX-referror=513%40ippbx.siei.local>;tag=1886838770
To: "812-Test" <sip:8...@172.16.1.10>;tag-2035500965
Call-Id: 11780462...@BHC.BG.FB.BBD
Cseq: 56 BYE
Contact: <sip:8...@172.16.51.109:20830;x-sipx-nonat>
Max-Forwards: 20
Supported: replaces, path
User-Agent: Grandstream WP810 1.0.11.20
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE, MESSAGE
Content-Length:
Date: Tue, 06 Dec 2022 21:26:01 GMT

SIP/2.0 481 Call Leg/Transaction Does Not Exist
Via: SIP/2.0/UDP 172.16.1.10;branch-z9hG4bK-XX-b597F7FK30V73axkq" hUg
Via: SIP/2.0/UDP 172.16.51.109:20830;branch-z9hG4bK1286403075;rport=20830
From: <sip:8...@172.16.1.10;X-sipX-referror=513%40ippbx.siei.local>;tag=1886838770
To: "812-Test" <sip:8...@172.16.1.10>;tag-2035500965
Call-ID: 11780462...@BHC.BG.FB.BBD
CSeq: 56 BYE
Contact: <sip:8...@172.16.51.113:5060>
Supported: replaces, path, timer
User-Agent: Grandstream GXP1450 1.0.8.9
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE, MESSAGE
Content-Length: