Hi,
On Sat, Oct 28, 2017 at 05:34:04PM +0300, Soltanici Ilie wrote:
Having the following Header: Record-Route: sip:192.168.1.1;lr;did=637.07c7c2d7
How can i extract only IP value from this header?
Generally, when presented with a URI, you can extract the host/domain component using the URI transformations, e.g.
$(hdr(Record-Route){nameaddr.uri}{uri.host})
If you are dealing with a single Record-Route header that has a singular URI value, this should work fine.
More generally, a concern here would be that Record-Routes can occur in a variety of configurations. For one, they can be stacked if the message has gone through multiple proxies which each add their own RR, e.g.
Record-Route: sip:proxy1;lr Record-Route: sip:proxy2;lr Record-Route: sip:proxy3;lr
If so, you will need to refer to the appropriate header subscript in order to extract the domain you really want, i.e. $hdr(name)[N]), as explained here:
https://www.kamailio.org/wiki/cookbooks/5.0.x/pseudovariables#hdr_name_-_hea...
SIP also allows the above to be compacted into a single RR header containing multiple URIs, i.e.
Record-Route: sip:proxy1;lr,sip:proxy2;lr,sip:proxy3;lr
So a truly bulletproof approach would have to make accommodations for that scenario as well.
In situations where a given approach can only work for a small subset of possibilities, I am inclined to ask: what is the real problem you are trying to solve? Could it perhaps be solved another way?
-- Alex