Hi
1. Do we need two(server and client) spi values at the time of
communication over UDP or TCP ?
Yes two Spi values required mostly for tcp
UDP case : UE sending Register to PCSCF uses Spi-c(UE) and P-CSCF
sends response back using Spi-c(PCSCF)
TCP case : UE sending Register to PCSCF uses Spi-c(UE) and P-CSCF
sends response back using Spi-s(PCSCF)
As Same socket will be used for sending responses
on which request came
2. At the time of communication how can we share the pre-shared key ?
Keys to encrypt,decrypt is communicated to PCSCF during
Registration-401 flow where
S-CSCF will send IK,CK keys in 401 response towards P-CSCF which P-CSCF
will remove before relaying 401 to UE .UE would generate these keys
from SIM .
Thanks
Ankur Bansal
On Mon, Jun 1, 2015 at 12:53 PM, Priyaranjan Nayak <
priyaranjan4...@gmail.com> wrote:
> Hi All,
>
> We have a SIP client (endpoint) and wanted to integrate IPSec to the SIP
> Client.
> The client will sent the Security-Client header to server and server will
> sent the Security-server header to the client. In these messages client and
> server are sending the spi-c and sip-s value to each other for further
> communication. Could you please clarify me below questions ?
>
> 1. Do we need two(server and client) spi values at the time of
> communication over UDP or TCP ?
> 2. At the time of communication how can we share the pre-shared key ?
>
> Thanks
> Priyaranjan
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