# Channel URI structure

> Reference the Uniform Resource Identifier format for Vivox channels.

A channel URI uses the following format:

sip:[confctl-g-issuer.lobby@mt1s.vivox.com](mailto:confctl-g-issuer.lobby@mt1s.vivox.com).

The following list details each part of the channel URI structure:

* sip - indicates a SIP channel

* confctl-g - a Confctl reference with a channel type

  * d for a positional channel
  * e for an echo channel
  * g for a non-positional channel

* issuer - the server issuer

* lobby - the name of the channel

  > **Note:**
  >
  > This uses the same character and length criteria as the account name.

* @mt1s.vivox.com - the Vivox server that the user is connecting to

> **Note:**
>
> Ensure that the chan\_uri parameter is a [fully qualified identifier](../parameters/fully-qualified-identifiers).

Positional URIs have additional requirements and use the following structure:

sip:confctl-\{channelTypeStr}-\{issuer}.\{channelName}!p-\{audibleDistance}-\{conversationalDistance}-\{audioFadeIntensityRounded}-\{audioFadeModelAsInt}@\{domain}

For example:

sip:\[confctl-d-issuer.lobby\![p-32-1-1.000-1@mt1s.vivox.com](mailto:p-32-1-1.000-1@mt1s.vivox.com)|mailto:confctl-d-myissuer.lobbyChannel\![p-32-1-1.000-1@mt1s.vivox.com](mailto:p-32-1-1.000-1@mt1s.vivox.com)]

> **Note:**
>
> The ChannelId.ToString() method will convert the ChannelId into a channel URI string. You may use this method to examine your ChannelId objects to see an example of the URI.