[SR-Users] I-CSCF Prefixes IMPU with + Symbol

[Ron McLeod]

I am working with v5.0.3 and the IMS extensions.

When I attempt to send a SIP MESSAGE from the application server towards the
UE, the I-CSCF used to determine the S-CSCF for the subscriber by sending a
Location-Info request to the HSS.  I found that this request was failing
because the IMPU (IMS Public User Identity) was being mangled by the I-CSCF,
prefixing the user part with a + symbol.

The example configuration file for the I-CSCF does in-fact does cause the
r-uri to be prefixed with a + symbol if one is not already present.  I'm
wondering why since it breaks the LIR/LIA lookup.


AS                    I-CSCF                      HSS
| MESSAGE                |                         |
| ---------------------> |                         |
| sip:ron at provider1.test |                         |
|                        |                         |
|                        |                         |
|                        | LIR                     |
|                        | ----------------------> |
|                        | sip:+ron at provider1.test |
|                        |                         |
|                        |                         |
|                        | DIAMETER_UNKNOWN_USER   |
|                        | <---------------------- |
|                        |                         |
|                        |                         |
| 403                    |                         |
| <--------------------- |                         |
| FORBIDDEN              |                         |


route{
#!ifdef WITH_DEBUG
    xlog("I-CSCF >>>>>>>>>>>>>>>>>>>> $rm $ru ($fu => $tu ($si:$sp) to $tu,
$ci)\n");
#!endif

    if !($rU =~ "\+.*") {
        prefix("+");
    }
...


Thanks,
Ron
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