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Below SAC15 is session-group on SBC configured with RoundRobin and 3 session-agents.

Example xml file (compress the .xml file with gzip and put in /code/lrt directory):
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<localRoutes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<route>
		<user type="E164">9783723035</user>
		<next type="regex">!(^.*$)!sip:\1@sa8.taclab.acmepacket.net!</next>
	</route>
	<route>
		<user type="E164">9783723040</user>
		<next type="regex">!(^.*$)!sip:\1@sa9.taclab.acmepacket.net!</next>
	</route>
	<route>
		<user type="E164">9783723038</user>
		<next type="regex">!(^.*$)!sip:\1@SAC15!</next>
	</route>
	<route>
		<user type="E164">9783723039</user>
		<next type="regex">!(^.*$)!sip:\1@SAC20!</next>
	</route>
</localRoutes>


local-routing-config
        name                                    lookupI
        file-name                               lrtTestI.xml.gz
        prefix-length                           10
        string-lookup                           disabled
        retarget-requests                       enabled
        match-mode                              exact

local-policy
        from-address                            4531
        to-address                              *
        source-realm                            access
        description
        activate-time
        deactivate-time
        state                                   enabled
        policy-priority                         none
        policy-attribute
                next-hop                                lrt:lookupI
                realm                                   core
                action                                  none
                terminate-recursion                     disabled
                carrier
                start-time                              0000
                end-time                                2400
                days-of-week                            U-S
                cost                                    0
                state                                   enabled
                app-protocol
                methods
                media-profiles
                lookup                                  single
                next-key
                eloc-str-lkup                           disabled
                eloc-str-match

local-policy
        from-address                            4515
        to-address                              *
        source-realm                            access
        description
        activate-time
        deactivate-time
        state                                   enabled
        policy-priority                         none
        policy-attribute
                next-hop                                SAG:SAC15
                realm                                   core
                action                                  none
                terminate-recursion                     enabled
                carrier
                start-time                              0000
                end-time                                2400
                days-of-week                            U-S
                cost                                    0
                state                                   enabled
                app-protocol
                methods
                media-profiles
                lookup                                  single
                next-key
                eloc-str-lkup                           disabled

session-group
        group-name                              SAC15
        description
        state                                   enabled
        app-protocol                            SIP
        strategy                                RoundRobin
        dest                                    sa7.taclab.acmepacket.net
                                                sa8.taclab.acmepacket.net
                                                sa9.taclab.acmepacket.net
        trunk-group
        sag-recursion                           enabled
        stop-sag-recurse                        401,407


If the call is To: 19783723035 for example and you need to strip the one, create a translation-rules:
translation-rules
        id                                      remOne
        type                                    delete
        add-string
        add-index                               0
        delete-string                           1
        delete-index                            0

Refer to the name, in session-translation (and use the name, in realm-config, or session-agent in the in-translationid field:

session-translation
        id                                      rule-in
        rules-calling
        rules-called                            remOne
        last-modified-by                        admin@console
        last-modified-date                      2016-05-31 13:17:12


In realm-config (or relevant session-agent), put:
in-translationid                        rule-in