[OpenSIPS-Users] REFER - Transferring Best Practice.

[Adrian Georgescu]

Yes,  this is the only way to be able control the success of the call transfers, actually the PBX administrator will make sure that the phone is trusted and can honor all transfers request correctly.

It may be possible to achieve this with the B2BUA module as suggested, as long as you control the B2BUA part you can do it.

Adrian

On Sep 15, 2010, at 6:23 PM, David J. wrote:

>  Adrian,
> 
> So in that case I would need to have a PBX, such as Asterisk, or 
> FreeSWITCH to handle this case, which would mean the PBX has to be in 
> the call path the entire time?
> 
> Thanks.
> 
> 
> 
> On 9/15/10 12:17 PM, Adrian Georgescu wrote:
>> Call transfer using SIP require cooperation between the 3 end-points involved.
>> 
>> On the public internet, which is probably why you want to use OpenSIPS, this does not work primarily because of accounting reasons. You can configure the SIP proxy to route the Refer and Notify alright but as an end-point you will not succeed at instructing for instance  a remote PSTN gateway to transfer the call to some other end-point because you have no trust relationship with it and nobody can be billed for this new call leg.
>> 
>> Handling the routing of REFER in OpenSIPS is trivial but it will not solve your problem.
>> 
>> The only way you can make transfer work reliably is behind the same PBX.
>> 
>> Adrian
>> 
>> 
>> On Sep 15, 2010, at 6:02 PM, David J. wrote:
>> 
>>>  Seems like when I try to transfer a call from one user to the next, it
>>> does not do anything, so I am guessing we have to handle the REFER message?
>>> 
>>> What is the best practice for handling REFER messages?
>>> 
>>> Thanks.
>>> 
>>> 
>>> 
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>> 
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> 
> 
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