Ranjit,
Based on the further detail you provide below I conclude that this is
most likely a question about 3GPP IMS behavior and specifications. I
suggest that you take this to a 3GPP forum. (I don't know what that
would be. Hopefully one of the people here who are involved in 3GPP can
make say more.)
Thanks,
Paul
On 10/6/19 11:42 PM, Ranjit Avasarala wrote:
Hi Philip
Yes, I agree that connection and relation to UE are maintained by P-CSCF
and S-CSCF does not need them. But in some call scenarios, the S-CSCF
connects to subsequent network elements like MRF and it is supposed to
pass the "ue-addr" parameter it receives from P-CSCF (in Contact header)
as is - without removing it
E.g. there are 2 scenarios
Scenario-1: INVITE from Access-SBC to S-CSCF with ue-addr: Contact:
*<sip:+12139598...@pcsf-prim.imsgroup0-017.wb3il01pcf.wb1il.uvp.itn.att.net:5060;gr=urn:uuid:227deca7-0d76-4ca6-8b5a-3ba63e6c4b89;b2bdlg=5cc32c49-5d93a27231a5f4a9-mw-po-lucentPCSF-000050;ue-addr=205.173.58.13>;+g.3gpp.icsi*-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";video;mobility="fixed"
Scenario-2: INVITE from Interconnect SBC to S-CSCF with ue-addr:
Contact:
*<sip:+13139588066@[2001:1890:1001:2ff4::15]:5060;ue-addr=208.86.89.249>;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";+g.3gpp.mid-call;+g.3gpp.srvcc-alerting;+g.3gpp.ps2cs-srvcc-orig-pre-alerting*
*
*
In case of Scenario-1: the S-CSCF is passing the ue-addr in Contact as
is towards next hop but in Scenario-2, the S-CSCF is removing the
ue-addr before passing the INVITE to next hop
Question: why is S-CSCF removing ue-addr parameter in Scenario-2 and
not removing in Scenario-1? Does the position of ue-addr parameter in
Contact header matter?
On Sun, Oct 6, 2019 at 12:00 PM Philipp Schöning <schoenin...@gmail.com
<mailto:schoenin...@gmail.com>> wrote:
Hi Ranjit,
I can't answer the question, but I have another question:
Isn't the connection and relation to the UE maintained by the P-CSCF?
>From my perspective the S-CSCF does not have any relation to the UE.
BR
Philipp
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