SIP/2.0 503 Service Unavailable

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Got SIP response 503 "Service Unavailable." back from 23.45.67.89

Check codecs for your server and your provider. Often there are no matching and call is not possible.

503 "Service unavailable: no more gws" back from 22.33.44.55 - Provider does not have more open lines to serve your calls.

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