[SIPForum-discussion] (no subject)
Deepanshu
deepanshu at huawei.com
Tue Jun 19 03:28:47 UTC 2007
The I-CSCF function can be removed from the signalling path once it has been used to establish which S-CSCF is in use. But if the THIG functionality is used in I-CSCF then it MUST remain in the signalling path (for encryption and decryption purpose).
So in your scenario. The call flow will be like:
UE1 ---> P-CSCF ---> S-CSCF ----> I-CSCF ----> S-CSCF ----> UE2
The Serving-CSCF handling session origination performs an analysis of the destination address, and determines that it belongs to a subscriber of the same operator. The request is therefore forwarded to a local I-CSCF. The I-CSCF queries the HSS for current location information, and finds the user either located in the home service area, or roaming. The I-CSCF therefore forwards the request to the S-CSCF serving the destination user
HTH
Deepanshu Gautam
R&D Engineer
Huawei Technologies Co Ltd.
91, BaiXia Rd, Nanjing, PRC
----- Original Message -----
From: Deepak Innaini
To: Deepanshu
Sent: Monday, June 18, 2007 6:24 PM
Subject: RE: [SIPForum-discussion] (no subject)
Thanks deepanshu,
I have one more query for you......
Suppose UA1 and UA2 are served by same S-CSCF and THIG functionality is implemented in I-CSCF.......so while UA'S getting registered in 200 OK response will contain
SERVICE ROUTE = ICSCF AND SCSCF ADDRESS
PATH = ICSCF AND PCSCF ADDRESS
So when UA1 had sent invite to UA2 and invite has reached S-CSCF.........we know that in IMS a call will be terminated on UA2 by checking the PATH header which he receives in 200 OK response for REGISTER message......my query is whether S-CSCF will route the call to UA2 via I-CSCF, P-CSCF.......or directly to P-CSCF......
Can you tell me the call flow in this scenario..
With regards
Deepak Innani | IMS (Testing) | Tech Mahindra
9/7, Hosur road, Bangalore-560029.
Office: 91-80-41159800 | Extn:1240 | Cell: 9901483038
Email: innanid at techmahindra.com
www.techmahindra.com
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From: Deepanshu [mailto:deepanshu at huawei.com]
Sent: Mon 6/18/2007 3:32 PM
To: Deepak Innaini
Subject: Re: [SIPForum-discussion] (no subject)
When S-CSCF perform a DNS query it will get the address of itself (or i can say S-CSCF will not do DNS query at all bcause it can recognize B as being served by itself), so it will send the request directly to B.
I-CSCF only comes into picture when B is being served by different S-CSCF
For it very clear, no confusion
----- Original Message -----
From: Deepak Innaini
To: Deepanshu
Sent: Monday, June 18, 2007 5:53 PM
Subject: RE: [SIPForum-discussion] (no subject)
Hi deepanshu,
Can you give me the reason why it does not to I-CSCF..........i too had the same idea but somebody told me that it will go through I-CSCF so i was little bit confused.......
Deepak Innani | IMS (Testing) | Tech Mahindra
9/7, Hosur road, Bangalore-560029.
Office: 91-80-41159800 | Extn:1240 | Cell: 9901483038
Email: innanid at techmahindra.com
www.techmahindra.com
----------------------------------------------------------------------------
From: Deepanshu
Sent: Mon 6/18/2007 3:12 PM
To: Deepak Innaini
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] (no subject)
No
----- Original Message -----
From: Deepak Innaini
To: discussion at sipforum.org
Sent: Monday, June 18, 2007 3:23 PM
Subject: [SIPForum-discussion] (no subject)
Hi ,
In IMS when UA1 and UA2 are served by same S-CSCF(originating and terminating S-CSCF are same) whether an INVITE message passes through I-CSCF ????????????
UA1 registered to S-CSCF.
UA2 registered to S-CSCF.
Deepak Innani.
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