19 Jun
2003
19 Jun
'03
10:19 p.m.
That's imho unnecessary but legal. I would call it "redundant overriding of
identical connection data."
RFC2327:
"In general, session-level values are the default for all media unless overridden
by an equivalent media-level value."
"The "c=" field contains connection data. A session announcement must
contain
one "c=" field in each media description (see below) or a "c=" field
at the
session-level."
-jiri
At 08:55 PM 6/19/2003, Maxim Sobolev wrote:
Folks,
This question isn't directly related to a SER, but does anybody know why Cisco IOS
inserts several identical `c=<IP>' lines in SDP which it generates? No other UA
I know about does that. I wonder because it creates a problems with SDP rewriting in
nathelper module and I need to decide whether I have to modify nathelper to cope with that
or open a Cisco TAC case instead.
Any comments are appreciated!
-Maxim
SIP/2.0 200 OK
Via: SIP/2.0/UDP 67.104.130.102:5061
From:
<sip:0118000@67.104.130.102:5061;user=phone>;tag=bb4b39670c51e5c737c5de99b5450cc5
To: <sip:61412722777@64.180.102.72;user=phone>;tag=357A3908-2F6
Date: Tue, 17 Jun 2003 07:35:12 GMT
Call-ID: 2920698556(a)192.168.1.100
Server: Cisco-SIPGateway/IOS-12.x
CSeq: 2 INVITE
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE, NOTIFY, INFO
Allow-Events: telephone-event
Contact: <sip:61412722777@67.104.130.107:5060>
Content-Type: application/sdp
Content-Length: 285
v=0
o=CiscoSystemsSIP-GW-UserAgent 7069 1539 IN IP4 67.104.130.107
s=SIP Call
c=IN IP4 67.104.130.107
^^^^^^^^^^^^^^^^^^^^^^^
t=0 0
m=audio 19044 RTP/AVP 4 19 101
c=IN IP4 67.104.130.107
^^^^^^^^^^^^^^^^^^^^^^^
a=rtpmap:4 G723/8000
a=rtpmap:19 CN/8000
a=fmtp:4 annexa=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
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Jiri Kuthan http://iptel.org/~jiri/