04-17-2007 11:49 PM - edited 03-14-2019 09:01 PM
I have situation like this:
A -> B -> C
A - some phone from PSTN network
B - IP phone registered with Call Manager; it has call forward to C
C - mobile phone
Phone A calls B, and call is forwarded to C phone. When call goes from B to C, I see A number as calling and C number as called. Is it possible to have B number as calling and C number as called?
Thanks
04-18-2007 04:42 AM
Hi Vlaho,
Have a look at this doc, it describes the method to change what number is shown on redirect (from Originating to Redirecting > in your case to change from A to B);
Failure to Forward Call Offsite - Issue with Calling Device Number
From this good tech note;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080618a74.shtml
Hope this helps!
Rob
04-18-2007 04:54 AM
Hi Rob,
you suggestion is right but this is strange if you think about it. To make the transfer, CCM places a new call to PSTN, apparently presents ANI of A, telco happily accepts it and deliver it to C as calling number ?!?
This means, the system can originate calls with arbitrary caller-id to (at least) cell-phones user. One malicious person could easily use caller-id as police number, or any other exploitation of this.
I'm not sure if this is know, understood and accepted by the all involved parties (telco, company, and telecommunication regulatory body).
04-18-2007 05:49 AM
Hi Paolo,
You are correct :) this is quite a gap! Most Telcos won't accept this non-billable number (thus the doc that I sent Vlaho) but many do. We do not allow Call Forward External so this has never been a problem for us, but this is something that, as Administrators,we need to keep an eye on.
Keep up the great work and take care!
Rob
04-26-2007 08:05 AM
Hi Rob,
I didn't try to configure call forwarding as it was in document you send. The Telco has configured that C phone see gateway number of site. They are happy with that solution, so I leave that situation as it is.
Thanks for the document.
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