[SR-Users] Matching the From Username in LCR rule table

Hi Experts, We wished to used the LCR Module to be able to select the Gateway(s) to send the calls to based on the From(Caller) Username. Based on the LCR Documentation, the usage of other fields like request URI or prefix etc is pretty clear. But for the From Usename I am having certain trouble understanding the same. It refers to some mtree. Excerpt below: "A gateway matches a request if user part of Request-URI matches "prefix", caller URI matches "from_uri" pattern,* caller URI userpart matches mtree with "mt_value"*, and callee URI matches "request_uri" pattern in a tuple that is associated with the gateway." Can someone explain/ share a sample lcr_rule table entries for the From Username that can be matched against the incoming sip message for gw selection? Do we need to manually create an mtree by the name "*lcr*". Asking based on the below section in LCR documentation? Any pointers are highly appreciated. 3.35. mtree (string) Name of mtree to which load_gws() matches caller URI userpart. *Default value is "lcr".* Regards, Harneet Singh -- "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth" - Sir Arthur Conan Doyle