##### Dialup service link

Service link of this type has the same parameters as the periodic service link (see Periodic service link) plus the following specific parameters:

- Login, Password are to be used for the user’s authorization on the access server. On successful authorization the server establishes connection and issues the dynamic IP from a pool. These parameters are cached by UTM5 RADIUS.
  While accepting the login, UTM5 RADIUS may automatically cut off the prefix defined by the `radius_realm` parameter.

- Allowed CID is a regular expression to check against the Calling-Station-ID attribute of the authentication request. This parameter is cached by UTM5 RADIUS. If the regex is set, but the attribute does not match it or is missing, the authorization is denied.
- Allowed CSID is a regular expression to check against the Called-Station-ID attribute of the authentication request. This parameter is cached by UTM5 RADIUS. If the regex is set, but the attribute does not match it or is missing, the authorization is denied.
- Callback allowed instructs the RADIUS server to check the incoming login (the part after colon) against the Callback standard. This parameter is cached by UTM5 RADIUS.

- Ringdown allowed instructs the RADIUS server to check the incoming login for all non-Callback calls. This parameter is cached by UTM5 RADIUS. If neither Callback allowed nor Ringdown allowed are set, the authorization with the given login and password is denied.

Parameters of the service itself are described in Dialup service.