<-- SIP read from 203.45.xxx.xxx:5060:
INVITE sip:12@202.51.xxx.xxx:5060;user=phone SIP/2.0
Via: SIP/2.0/UDP 203.45.xxx.xxx:5060;branch=z9hG4bKa2213cbB00FDB44
From: "guest" <sip:202.51.xxx.xxx@202.51.xxx.xxx>;tag=C2DFF498-A8728C09
To: <sip:12@202.51.xxx.xxx;user=phone>
CSeq: 1 INVITE
Call-ID: a5d0a7d5-bc542dbe-eac1f73f@203.45.xxx.xxx
Contact: <sip:202.51.xxx.xxx@203.45.xxx.xxx:5060>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER
User-Agent: PolycomSoundPointIP-SPIP_430-UA/1.6.6.0042
Supported: 100rel,replaces
Allow-Events: talk,hold,conference
Max-Forwards: 70
Content-Type: application/sdp
Content-Length: 250

v=0
o=- 978312534 978312534 IN IP4 203.45.xxx.xxx
s=Polycom IP Phone
c=IN IP4 203.45.xxx.xxx
t=0 0
a=sendrecv
m=audio 10002 RTP/AVP 8 0 18 101
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:18 G729/8000
a=rtpmap:101 telephone-event/8000

--- (14 headers 11 lines) ---
Using INVITE request as basis request - a5d0a7d5-bc542dbe-eac1f73f@203.45.xxx.xxx
Sending to 203.45.xxx.xxx : 5060 (non-NAT)
Found no matching peer or user for '203.45.xxx.xxx:5060'
Mar 25 15:51:08 NOTICE[8423]: chan_sip.c:10635 handle_request_invite: Failed to authenticate user "guest" <sip:202.51.xxx.xxx@202.51.xxx.xxx>;tag=C2DFF498-A8728C09
Reliably Transmitting (no NAT) to 203.45.xxx.xxx:5060:
SIP/2.0 403 Forbidden
Via: SIP/2.0/UDP 203.45.xxx.xxx:5060;branch=z9hG4bKa2213cbB00FDB44;received=203.45.xxx.xxx
From: "guest" <sip:202.51.xxx.xxx@202.51.xxx.xxx>;tag=C2DFF498-A8728C09
To: <sip:12@202.51.xxx.xxx;user=phone>;tag=as562a930d
Call-ID: a5d0a7d5-bc542dbe-eac1f73f@203.45.xxx.xxx
CSeq: 1 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Length: 0


---
box1*CLI>
<-- SIP read from 203.45.xxx.xxx:5060:
ACK sip:12@202.51.xxx.xxx:5060 SIP/2.0
Via: SIP/2.0/UDP 203.45.xxx.xxx:5060;branch=z9hG4bKa2213cbB00FDB44
From: "guest" <sip:202.51.xxx.xxx@202.51.xxx.xxx>;tag=C2DFF498-A8728C09
To: <sip:12@202.51.xxx.xxx;user=phone>;tag=as562a930d
CSeq: 1 ACK
Call-ID: a5d0a7d5-bc542dbe-eac1f73f@203.45.xxx.xxx
Contact: <sip:202.51.xxx.xxx@203.45.xxx.xxx:5060>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER
User-Agent: PolycomSoundPointIP-SPIP_430-UA/1.6.6.0042
Max-Forwards: 70
Content-Length: 0


--- (11 headers 0 lines) ---
Destroying call 'a5d0a7d5-bc542dbe-eac1f73f@203.45.xxx.xxx'
box1*CLI>