Hi Ankur, Thanks for your valuable information. I am seeing two SPI value are used in between two normal UDP socket communication. Below is the wireshark snippet [image: Inline image 2]
Could you please clarify me why is it happening ? Do we have any scenario where UDP will use two SPI values ? On Mon, Jun 1, 2015 at 9:39 PM, ankur bansal <abh.an...@gmail.com> wrote: > 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 >> _______________________________________________ >> Sip-implementors mailing list >> Sip-implementors@lists.cs.columbia.edu >> https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors >> > > -- Thanks Priyaranjan
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