The Request URI (request line) is the one that should be used for any routing purpose. The To field is a purely cosmetic commentary on the intended logical destination of the call--it should never be used for routing determination.

Amar S Tuladhar <amar@smarttel.com.np> wrote:

Hi all,

What is the difference between “Called number address in Request-Line” and “Called number in TO field”?
If the “Called Number” address is different which one shall be taken? Is there any RFC recommendation governing this?

For example : if in “REQUEST-LINE” it is 61977 and in “TO” it is 00977. Which (61977 or 00977) shall be used to look for routing purpose?

Thanks a lot.
Amar S Tuladhar
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