Following screenshots show an example outgoing call from the enterprise to Bell Canada.
SIP/2.0 401 Unauthorized
13c4-55013-19b8-44869384-19b8
Call-ID: 345a1170-870a6122-13c4-55013-19b8-6f233c7e-19b8
CSeq: 1 INVITE
Via: SIP/2.0/UDP 10.10.97.34:5060;branch=z9hG4bK-19b8-6479a3-c1d6dbd
WWW-Authenticate: DIGEST
qop="auth",nonce="BroadWorksXh8hpmutwT1lz2y4BW",realm="sipxxxxxxxx.bell.ca",algorit
hm=MD5
Content-Length: 0
13c4-55013-19b8-44869384-19b8
Call-ID: 345a1170-870a6122-13c4-55013-19b8-6f233c7e-19b8
CSeq: 1 INVITE
Via: SIP/2.0/UDP 10.10.97.34:5060;branch=z9hG4bK-19b8-6479a3-c1d6dbd
Max-Forwards: 70
Supported: sipvc,x-nortel-sipvc,100rel,replaces,timer
User-Agent: Nortel Networks BCM VoIP Gateway release_46 version_46.51.0.33
Route: <sip:220.20.237.201:5060;lr>
x-nt-corr-id: 345a1170-870a6122-13c4-55013-19b8-6f233c7e-19b8
Session-Expires: 90
Allow: INVITE,INFO,ACK,OPTIONS,CANCEL,BYE,NOTIFY,PRACK,UPDATE,REFER
Content-Type: application/sdp
Content-Length: 263
v=0
o=- 1350677620 1350677620 IN IP4 10.10.97.34
s=-
c=IN IP4 10.10.97.34
t=0 0
m=audio 30142 RTP/AVP 0 18 101 111
c=IN IP4 10.10.97.34
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=rtpmap:111 X-nt-inforeq/8000
a=sendrecv
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