# Parameters

## `accept` (string)

This parameter is the content of the Accept header field. Note: it is not clearly written in RFC3261 if a proxy should accept any content (the default "*/*") because it does not care about content. Or if it does not accept any content, which is "".

Default value is "*/*".

Set `accept` parameter

    ...
    modparam("options", "accept", "application/*")
    ...

## `accept_encoding` (string)

This parameter is the content of the Accept-Encoding header field. Please do not change the default value because SER does not support any encodings yet.

Default value is "".

Set `accept_encoding` parameter

    ...
    modparam("options", "accept_encoding", "gzip")
    ...

## `accept_language` (string)

This parameter is the content of the Accept-Language header field. You can set any language code which you prefer for error descriptions from other devices, but presumably there are not much devices around which support other languages then the default English.

Default value is "en".

Set `accept_language` parameter

    ...
    modparam("options", "accept_language", "de")
    ...

## `supported` (string)

This parameter is the content of the Supported header field Here you can enter the extensions which are supported by your SER config. Normally you should only use values here which are registered with the IANA.

Default value is "".

Set `supported` parameter

    ...
    modparam("options", "supported", "100rel")
    ...

## `contact` (string)

The content of this parameter will be inserted into the reply as the URI of the Contact header. If this parameter is empty (default case) then no Contact header in included in the reply. If this parameter is set to "dstip" the reply contains a Contact header with the IP, port and transport of the socket where the request was sent to. If this parameter is set to "ruri" the reply contains a Contact header with the same URI as the request URI of the original OPTIONS request.

Default value is "".

Set `contact` parameter

    ...
    modparam("options", "contact", "example.com")
    ...

## `contact_param` (string)

This parameter is appended to the value of the Contact header is case it is set. If just this parameter is set but the contact module parameter not, then the contact parameter is automatically set to dstip.

Default value is "".

Set `contact_param` parameter

    ...
    modparam("options", "contact_param", "lr=on")
    ...