Yealink SIP-T4X Administrator's Manual page 424

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Table of Contents

Administrator's Guide for SIP-T4X IP Phones

The following SIP responses are supported:

1xx Response—Information Responses

1xx Response

181 Call Is Being Forwarded

183 Session Progress

2xx Response—Successful Responses

2xx Response

202 Accepted

3xx Response—Redirection Responses

3xx Response

300 Multiple Choices

301 Moved Permanently

302 Moved Temporarily

4xx Response—Request Failure Responses

4xx Response

400 Bad Request

401 Unauthorized

402 Payment Required

403 Forbidden

In REFER transfer.