Configured Station Name is published by SPA112 device in REGISTER's P-Station-Name header. See catched packed bellow (Station Name=Ustredna TEST)
REGISTER sip:10.B.C.1:5060 SIP/2.0
From: "6018" <sip:DEV-6018@10.B.C.1>;tag=ce2aebb4a48624fbo0
To: "6018" <sip:DEV-6018@10.B.C.1>
Authorization: Digest username="DEV-6018",realm="test.sip.L.M.cz",nonce="141c3772",
uri="sip:10.P.Q.1:5060",algorithm=MD5,response="d6a320488f37acb05ad8eef315f6e7fc"
Contact: "6018" <sip:DEV-6018@10.X.Y.11:5060>;expires=3600
P-Station-Name: ;mac=c4........90; sn=CCQ......LR
User-Agent: Cisco/SPA112-1.3.2(009)
P-Station-Name: Ustredna TEST ;mac=c4........90; display="Ustredna TEST"; sn=CCQ......LR
...
Unfortunatelly, the header is sent twice in REGISTER. The first one without Station Name, the second with Station Name. As far as I know, the behavior how to interpret multiple P-Station-Name headers in one packet is not defined. So it may confuse PBX and cause unpredictable results. I assume it's bug, not intentional feature.
It would be nice if such bug will be patched ...
Note, the catched packet has been sent from device with unreleased firmware 1.3.2(009) but the same behavior has been observer on 1.3.1.
