Inquiry about rtpengine subscribe functionality

Hi, Team

I have reviewed the documentation at https://www.kamailio.org/docs/modules/6.1.x/modules/rtpengine.html

I have the following questions:

1. Which SRS (Session Recording Server) has been tested with rtpengine_subscribe？

2. Should the Content-Type be application/sdp or multipart/mixed?

```
onreply_route[1]
{
...
    if (has_body("application/sdp")) {
        rtpengine_answer();
        rtpengine_subscribe_request("all siprec", "$avp(siprec_offer)",
                                    "$avp(siprec_to_tag)", "siprec_streams");
        xinfo("SIPREC participant $xavp(siprec_streams[0]=>tag) with label $xavp(siprec_streams[0]=>label[0])\n");
        xinfo("SIPREC participant $xavp(siprec_streams[1]=>tag) with label $xavp(siprec_streams[0]=>label[0])\n");
        #use the above steam information to build the siprec xml metadata, will just send sdp in this example
        $dlg_var(orig_to_tag) = $tt;
        $dlg_var(siprec_contact) = "sip:uac@" + $Ri;
        $dlg_var(siprec_to_tag) = $avp(siprec_to_tag);
        t_uac_send("INVITE","sip:siprec@siprec_server.example.com",
                   "siprec_server.example.com", "",
                   "To: <$tu>\r\n" +
                   "From: <$fu>\r\n" +
                   "Contact: <$dlg_var(siprec_contact)>\r\n" +
                   "Content-Type: application/sdp\r\n",
                   $avp(siprec_offer));
	}
...
}
```

The documentation mentions application/sdp, but when I tested with OpenSIPS 3.4's siprec module, it used multipart/mixed.

https://github.com/drachtio/drachtio-siprec-recording-server/blob/main/test/scenarios/uac_siprec_pcap.xml#L37

This example also shows multipart/mixed.
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