<div class="content" name="PHONEEXTENSIONID" uuid="e1661717-7694-4cc7-84fb-1540fee5bf4d"><p>The PHONEEXTENSIONID packet describes an extension
identifier. Extension identifiers are used to identify service
provider-specific extensions for phone device classes. PHONEEXTENSIONID is
supplied by the server in the field VarData of the returned version of the
phone <a href="59e34869-7701-4eb5-95d4-f8ce908ce17a" data-linktype="relative-path">NegotiateAPIVersion</a>
packet if the request is completed successfully.</p><table>
 <tbody><tr>
  <th><p><br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>1<br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>2<br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>3<br/>0</p></th>
  <th><p><br/>1</p></th>
 </tr>
 <tr>
  <td colspan="32">dwExtensionID0</td>
 </tr>
 <tr>
  <td colspan="32">dwExtensionID1</td>
 </tr>
 <tr>
  <td colspan="32">dwExtensionID2</td>
 </tr>
 <tr>
  <td colspan="32">dwExtensionID3</td>
 </tr>
</tbody></table><p><b>dwExtensionID0 (4 bytes): </b>An unsigned 32-bit
integer. The first part of the extension identifier. </p><p><b>dwExtensionID1 (4 bytes): </b>An unsigned 32-bit
integer. The second part of the extension identifier. </p><p><b>dwExtensionID2 (4 bytes): </b>An unsigned 32-bit
integer. The third part of the extension identifier. </p><p><b>dwExtensionID3 (4 bytes): </b>An unsigned 32-bit
integer. The fourth part of the extension identifier. </p><p>These four members together specify a universally unique
extension identifier that identifies a phone device class extension. This
packet cannot be extended.</p></div>