curious on this topic- we use set_contact_alias()on our SIP REGISTERs/INVITEs because we can't use the received parameter. we can't use the received parameter because our registrars are setup to accept traffic from two sets of edge proxies. one set of proxies supports the received param, the other set of proxies does not support the received param due to different network conditions.
but in any case, our setup works great, handle_ruri_alias() should be stripping the contact alias before it reaches the UAC and your edge proxy should be adding the contact alias on each request from the UAC. im wondering if you can share more of your config with me so i can understand how this is happening.

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