[SIPForum-discussion] Dynamically enable and disable CallForwarding from a VoIP Phone

[Vivek Batra]

Some proxy/ IPPBX (B2BUA) uses the access codes to enable/ disable the
feature. Say 123 is the access code to enable CF-U and 456789 is the
destination where you want to forward the calls, your SIP device initiates
the call to proxy having the number (123+456789) and Proxy/ B2BUA enables
the CF-U for the caller.

 

Best Regards,

Vivek Batra

 

  _____  

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of sreekant nair
Sent: Friday, January 30, 2009 10:17 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Dynamically enable and disable CallForwarding
from a VoIP Phone

 

Hello,

I am trying to implement the most common three flavors of Call Forwarding
(Call Forward Busy- CFB, Call Forward No Answer - CFNA and Call Forward
Unconditional - CFU)

The first two are relatively straight forward with some involvement from the
User Agent and proxy  during the actual call event. 

However, when it comes to CFU, all the literature ( in OpenSER and
http://www.tech-invite.com/Ti-sip-service-7.html etc) points to the Proxy
being pre-configured with the information that any incoming call to User X
must be forwarded to User Y. This is fine when it comes to the actual call
signalling/messaging. 

However, how is it set in the first place within the proxy. Is there a
method of doing this other than by for e.g. the proxy administrator
manually? Can a SIP User Agent enable/disable call forwarding at the proxy
using SIP signalling. To give a clearer picture - on my cell phone, I can
enable/disable call forwarding for some period of time. When we do this, the
service provider's MSC/HLR is updated with this information so that the call
is automatically routed to the forwarded number. This call flow is very
clearly explained in the lint of Call Forwarding Unconditional at
"http://www.tech-invite.com/Ti-sip-service-7.html". It does not explain how
the feature is enabled.

Is using the "forwarding number/URI" in the Contact of the REGISTER message
an industry accepted practice? Is there any other way without involving the
phone so that proxy has prior knowledge and it is dynamic?

All ideas are welcome. 

Thanks
Sreekant Nair

 

 




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