[SR-Users] Error forwarding to SCSCF

[Jan Devai]

*Hi Experts,*

*I would like to ask you if some of you have already come across this
problem.*


*We are integrating Kamailio all in one Solution (P/I/S-CSCF having all
same IP only communicating between each other on different ports) taken
from Carsten Bock example against an external HSS.*


*The flow is as follows:*
UE                                 HSS
P-CSCF
I-CSCF                                 S-CSCF

--------------------------Sip Register-------------------------->

----------Sip Register--------->

<---------------------------------UAR--------------------------------

---------------------------------UAA-------------------------------->

                                   --------------SIP Register------->


*The last step "SIP Register" from I-CSCF to S-CSCF is not happenning for
some reason.*


*The Received AVP in UAA is "First Time Registration 2001 code".*




*Now we do not know whether this UAA answer is OK, or some other URI is
badly defined which could explain why I-CSCF has trouble contacting
S-CSCF.If someone have some logs, traces which could be used as a reference
for this scenario would be greatly appreciated.*


*Find theses messages we get in the shown logs below:*

*Thank you*




*JanThis file /rtc/kamailio_icscf/kamailio.cfg is a function which sends
message to SCSCF, see below:*

route[REG_UAR_REPLY]
{
    #xlog("$$avp(s:uaa_return_code) = $avp(s:uaa_return_code)\n");
    #this is async so to know status we have to check the reply avp
    switch ($avp(s:uaa_return_code)){
            case 1: #success
                    if (I_scscf_select("0")){
                            t_on_failure("register_failure");
                            t_on_reply("register_reply");
                            #now relay to appropriate SCSCF
                            if (!t_relay()) {
                                    t_reply("500", "Error forwarding to
SCSCF");
                            }
                    } else {#select failed
                            I_scscf_drop();
                            t_reply("500", "Server error on SCSCF Select
(UAR)");
                    }
                    break;
            case -1: #failure
                    xlog("L_ERR", "UAR failure - error response sent from
module\n");
                    break;
            case -2: #error
                    xlog("L_ERR", "UAR error - sending error response
now\n");
                    t_reply("500", "UAR failed");
                    break;
            default:
                    xlog("L_ERR", "Unknown return code from UAR, value is
[$avp(s:uaa_return_code)]\n");
                    t_reply("500", "Unknown response code from UAR");
                    break;
    }
}


*Kamailio is getting an answer: "t_reply("500", "Error forwarding to
SCSCF");"*
*which means that th function I_scscf_select("0") is fine but the other
function called "t_relay", is the one generating the error "Error
forwarding to SCSCF".*

*I-CSCF is not able to send the SIP message to S-CSCF, see this log below:*

Jul 16 14:59:22 cw-aio /usr/sbin/kamailio[31604]: ERROR: tm [t_fwd.c:1711]:
t_forward_nonack(): ERROR: t_forward_nonack: failure to add branches
Jul 16 14:59:23 cw-aio /usr/sbin/kamailio[31599]: INFO: ims_icscf
[cxdx_uar.c:71]: create_uaa_return_code(): created AVP successfully :
[uaa_return_code]
Jul 16 14:59:23 cw-aio /usr/sbin/kamailio[31605]: INFO: ims_icscf
[cxdx_avp.c:137]: cxdx_get_avp(): cxdx_get_server_name: Failed finding avp
Jul 16 14:59:23 cw-aio /usr/sbin/kamailio[31605]: INFO: ims_icscf
[cxdx_avp.c:137]: cxdx_get_avp(): cxdx_get_result_code: Failed finding avp
Jul 16 14:59:23 cw-aio /usr/sbin/kamailio[31605]: INFO: ims_icscf
[cxdx_uar.c:71]: create_uaa_return_code(): created AVP successfully :
[uaa_return_code]
Jul 16 14:59:23 cw-aio /usr/sbin/kamailio[31605]: ERROR: tm [ut.h:254]:
uri2dst2(): ERROR: uri2dst: bad_uri: scscf.epc.mnc004.mcc324.3gppnetwork.org
Jul 16 14:59:23 cw-aio /usr/sbin/kamailio[31605]: ERROR: tm [t_fwd.c:1711]:
t_forward_nonack(): ERROR: t_forward_nonack: failure to add branches
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