[SR-Users] Call Routing at IMS

[Iman Mohammadi]

Hi Everyone

When P-CSCF receives INVITE from client it sends INVITE to S-CSCF then
S-CSCF without any look up(checking the user is registered or not)sends
INVITE to I-CSCF then I-CSCF sends LIR and receives LIA and sends INVITE to
same S-CSCF (in case of one S-CSCF exists).My Question is here why without
any look up S-CSCF sends INVITE to I-CSCF??this procedure affects system
performance and increases call set up time
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