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Message: <blockquote data-quote="layyarx" data-source="post: 20146999" data-attributes="member: 356092">Uplink for this FXS box is 10 base T ethernet, hence you cannot directly uplink it to a pstn. If you directly connect it to a data network your SIP phones will not register due to port 5060 being blocked. You can try to connect it through a router & create tunnels in router with remote end to encapsulate SIP & RTP . But eventhough you mark your traffic as DSCP ef, once it hits service provider's cloud, they usually re mark your traffic to a lower QoS value which can make your calls sound jittery.But if you purchase 2 SIP lines from any service provider, you can achieve this task easily & port 5060 will not be clocked by SP</blockquote>

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