[asterisk-bugs] [JIRA] (ASTERISK-26333) Problems with Blind Transfer, PJSIP (Aastra 6869i)

[Matthias Binder (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-26333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=232567#comment-232567 ] 

Matthias Binder edited comment on ASTERISK-26333 at 10/6/16 1:08 PM:
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We came across that we have this issue also on our Snom M700 Station with M65 Handsets.

They told me that they have to wait until the call is answering on blind transfer before they can hangup the phone.


was (Author: mitterhuemer):
We came across that we have this issue also on our Snom M700 Station with M65 Handsets.

They told me that they have to wait that the call is answering on blind transfer before they can hangup the phone.

> Problems with Blind Transfer, PJSIP (Aastra 6869i)
> --------------------------------------------------
>
>                 Key: ASTERISK-26333
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26333
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: pjproject/pjsip
>            Reporter: Matthias Binder
>            Assignee: Unassigned
>         Attachments: asterisk capture + 6869i syslog.zip, capture-asterisk-good-case-chansip.pcap, chan_pjsip2.JPG, chan_pjsip.JPG, chan_sip.JPG, syslog-good-cas-chansip.pcap
>
>
> Sangoma told me to open a issue in the asterisk tracker.
> We cannot do PJSIP Blind Transfers on the Mitel 6869i Phone.
> The Problem is already analysed by Mitel Support and they made a Statement about the problem and showed up a workaround for this problem.
> The asterisk pjsip needs to be changed to solve the Problem.
> http://community.freepbx.org/t/problems-with-blind-transfer-pjsip-aastra-6869i/34393/20
> {quote}
> HI there,
> After having a look at the sip traces I have come to the following conclusion:
> The Problem:
> The channel drivers CHAN_SIP and CHAN_PJSIP seem to implement the REFER method differently.
> -- CHAN_SIP responds the REFER with an "202 Accepted" followed by a "200 OK" in NOTIFY sip/frag body as soon as Asterisk knows that the user can be reached.
> https://issues.asterisk.org/jira/secure/attachment/54361/chan_sip.JPG
> -- On the other hand CHAN_PJSIP notifies all the progress details of the C user e.g. Trying, Ringing etc. It sends a "200 OK" ONLY if the called user answers the call.
> https://issues.asterisk.org/jira/secure/attachment/54360/chan_pjsip.JPG
> https://issues.asterisk.org/jira/secure/attachment/54362/chan_pjsip2.JPG
> This leads to the stated issue because in case of Blind Transfer, Mitel Phones expect a "200 OK" after REFER has been accepted. Otherwise the line is kept busy. This is by-design with no intension to change it at the moment.
> {quote}



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