SIP Response Code

Meaning

400

Bad Request

401

Unauthorized

402

Payment Required

403

Forbidden

404

Not Found

405

Method Not Allowed

406

Not Acceptable

407

Proxy Authentication Required

408

Request Timeout

410

Gone

413

Request Entity Too Large

414

Request-URI Too Long

415

Unsupported Media Type

416

Unsupported URI Scheme

420

Bad Extension

421

Extension Required

423

Interval Too Brief

480

Temporarily Unavailable

481

Call-Transaction Does Not Exist

482

Loop Detected

483

Too Many Hops

484

Address Incomplete

485

Ambiguous

486

Busy Here

487

Request Terminated

488

Not Acceptable Here

491

Request Pending

493

Undecipherable

500

Server Internal Error

501

Not Implemented

502

Bad Gateway

503

Service Unavailable

504

Server Time-out

505

Version Not Supported

513

Message Too Large

600

Busy Everywhere

603

Decline

604

Does Not Exist Anywhere

606

Not Acceptable