### Description

Monitoring extensions by using KA function from the usrloc module it's not working for ws contacts

#### Log Messages

``` Oct 8 16:51:20 devsrv devsrv[31562]: ERROR: usrloc [ul_keepalive.c:277]: ul_ka_send(): unknown proto [5] for sending keepalive Oct 8 16:51:50 devsrv devsrv[31562]: DEBUG: usrloc [ul_keepalive.c:112]: ul_ka_urecord(): keepalive for aor: 101 Oct 8 16:51:50 devsrv devsrv[31562]: DEBUG: usrloc [ul_keepalive.c:236]: ul_ka_urecord(): keepalive request (len: 323) [[#012OPTIONS sip:gehtfehm@eg4avcve63ua.invalid;transport=ws SIP/2.0#015#012Via: SIP/2.0/WS 192.168.0.11:443;branch=z9hG4bKx.4.1.0#015#012From: sip:options@webrtc-gw.company.net;tag=uloc-c-5f7f3503-7b52-1-9abde102-5f7f3596-44823-4.1#015#012To: sip:101@webrtc-gw.company.net#015#012Call-ID: ksrulka-4.1#015#012CSeq: 80 OPTIONS#015#012Content-Length: 0#015#012#015#012]] Oct 8 16:51:50 devsrv devsrv[31562]: ERROR: usrloc [ul_keepalive.c:277]: ul_ka_send(): unknown proto [5] for sending keepalive ```

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` version: kamailio 5.4.1 (x86_64/linux) a6cb74 ```