All 3 of your options are technocally correct for both questions, however I
don't know if the lab grading has a preference for which one if you have to
indicate the line within the trace using arrows
I would personally use the first line of the header for tcp (your option 1)
and either the content type sdp (your option 2) if my explanation was vague
saying sdp in invite shows eo or i would use the m line of the sdp
itself if saying these codec (s) are offered in the invite showing eo. I
would not use content length because the other two are more specific, just
my opinion (hopefully this works out in my next lab).
-Justin
(Sent from my phone, please excuse and/or laugh at any typos.)
On Nov 13, 2013 12:08 AM, IE Target myfrnd...@gmail.com wrote:
What proves TCP
1)Outgoing SIP TCP
or
2)transport = tcp
or
3) VIA
What proves
Early Offer
1)content-length
or
2)content type
or
3)SDP itself
Outgoing SIP TCP message to 157.26.1.253 on port 5060 index 1
INVITE sip:321234567890@157.26.1.253:5060 SIP/2.0
Date: Tue, 12 Nov 2013 18:36:17 GMT
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER,
SUBSCRIBE, NOTIFY
From: HQ Phone 1 sip:2001@142.100.64.12
;tag=2af0b7a6-cadd-470e-807f-59a95570f443-34173098
Allow-Events: presence, kpml
P-Asserted-Identity: HQ Phone 1 sip:2001@142.100.64.12
Supported: timer,resource-priority,replaces
Min-SE: 1800
Remote-Party-ID: HQ Phone 1 sip:2001@142.100.64.12
;party=calling;screen=yes;privacy=off
Content-Length: 214
User-Agent: Cisco-CUCM7.0
To: sip:321234567890@157.26.1.253
Contact: sip:2001@142.100.64.12:5060;transport=tcp
Expires: 180
Content-Type: application/sdp
Call-ID: 4fbd2c00-28217521-1-c40648e@142.100.64.12
Via: SIP/2.0/TCP 142.100.64.12:5060;branch=z9hG4bK05cf14a0d
CSeq: 101 INVITE
Session-Expires: 1800
Max-Forwards: 70
v=0
o=CiscoSystemsCCM-SIP 2000 1 IN IP4 142.100.64.12
s=SIP Call
c=IN IP4 142.100.64.12
t=0 0
m=audio 24578 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
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