I have write sip resolver plugin, try to INVITE, but there is 480 response:

SIP INVITE request and nokia's response:
INVITE sip:123456@192.168.129.178 SIP/2.0
Via: SIP/2.0/UDP 192.168.129.86:5060;branch=z9hG4bK-c05c3300d667031094b6001b7806ca9c
From: "23 Clone" <sip:6321@192.168.129.86;user=phone>;tag=c05c3300d667031094b5001b7806ca9c
To: "123456" <sip:123456@192.168.129.178:5060;user=phone>
Call-ID: 9-XwFR7YoIcn-Mk6B72gGBsGzqZUmR
CSeq: 1 INVITE
Contact: <sip:6321@192.168.129.86;user=phone>
Accept-Contact: *;class="myclass"
P-Asserted-Identity: "23 Clone" <sip:6321@192.168.129.86;user=phone>
Max-Forwards: 10
Cisco-Guid: 2301124482-3030206468-2327348562-565159331
Content-Type: application/sdp
Content-Length: 196

v=0
o=- 1229333929 1229333929 IN IP4 192.168.129.86
s=-
c=IN IP4 192.168.129.86
t=0 0
m=audio 11986 RTP/AVP 18 101
a=rtpmap:18 G729/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16

-------

SIP/2.0 100 Trying
Via: SIP/2.0/UDP 192.168.129.86:5060;branch=z9hG4bK-c05c3300d667031094b6001b7806ca9c
To: "123456" <sip:123456@192.168.129.178;user=phone>
From: "23 Clone" <sip:6321@192.168.129.86;user=phone>;tag=c05c3300d667031094b5001b7806ca9c
Call-ID: 9-XwFR7YoIcn-Mk6B72gGBsGzqZUmR
CSeq: 1 INVITE
Content-Length: 0

------

SIP/2.0 480 Temporarily Not Available
Via: SIP/2.0/UDP 192.168.129.86:5060;branch=z9hG4bK-c05c3300d667031094b6001b7806ca9c
To: "123456" <sip:123456@192.168.129.178;user=phone>;tag=24ve19sdcthc6s8a1646
From: "23 Clone" <sip:6321@192.168.129.86;user=phone>;tag=c05c3300d667031094b5001b7806ca9c
Call-ID: 9-XwFR7YoIcn-Mk6B72gGBsGzqZUmR
CSeq: 1 INVITE
Content-Length: 0
Sip Client resolver plugin capabilities:
_LIT8(KCapabilities,
"<SIP_CLIENT ALLOW_STARTING=\"YES\">\
<SIP_HEADERS>\
<ACCEPT_CONTACT value=\"*;class=\"myclass\"\"/>\
<ACCEPT value=\"application/sdp\"/>\
<ACCEPT value=\"text/plain\"/>\
<ACCEPT value=\"\"/>\
</SIP_HEADERS>\
<SDP_LINES>\
<LINE name=\"m\" value=\"audio 0 RTP/AVP 18 101\" />\
</SDP_LINES>\
</SIP_CLIENT>");