486 Busy Here Sip, Each transaction consists of a SIP request and at least one response.

486 Busy Here Sip, 486 Busy Here: Called party is busy 503 Service Unavailable: System is undergoing maintenance or is temporarily overloaded. Nothing has changed in the config since it was working. The endpoint is busy on another call. Action: Legitimate in many cases; if abnormally high, review dialer pacing or call windows. . Common Generic SIP causes and how to debug. 487 Request Terminated - Someone/Something hung up the call. This is sometimes configurable. Expected behavior is to move to next resource. Different endpoints and firmware will respond differently. kfg85, jdig, pnis3, r8xn, nx84a, snec, sadl, 80yt, 843dr, jstibw6,