below is version and GW config :

FreeSWITCH Version 1.10.0-release+git~20190805T172826Z~7a921c608b~64bit (git 7a921c6 2019-08-05 17:28:26Z 64bit)

    <gateway name="5551110000">
        <param name="extension" value="5551110000"/>
        <param name="from-user" value="5551110000"/>
        <param name="from-domain" value="mydomain.us"/>
        <param name="username" value="myuser"/>
        <param name="password" value="mypass"/>
        <param name="extension-in-contact" value="true"/>
        <param name="expire-seconds" value="60"/>
        <param name="realm" value="mydomain.us"/>
        <param name="register-proxy" value="mydomain.us:35060"/>
        <param name="register" value="true"/>
        <param name="retry-seconds" value="30"/>
        <param name="register-transport" value="tcp"/>
        <param name="context" value="public"/>
    </gateway>