[Kamailio-Users] Registration delays when using Kamailio proxy

[vragukumar at signalogic.com]

Hello,

Here is some more information from wireshark,

"No.","Time","Source","Destination","Protocol","Info"
"1","0.000000","x_lite_softphone","SIP_proxy","SIP","Request: REGISTER
sip:SIP_server"
"2","0.000012","x_lite_softphone","SIP_proxy","SIP","Request: REGISTER
sip:SIP_server"
"5","0.818876","SIP_proxy","SIP_server","SIP","Request: REGISTER
sip:SIP_server"
"6","0.818886","SIP_proxy","SIP_server","SIP","Request: REGISTER
sip:SIP_server"
"7","0.824475","SIP_server","SIP_proxy","SIP","Status: 200 OK    (1
bindings)"
"15","2.635788","SIP_proxy","x_lite_softphone","SIP","Status: 200 OK    (1
bindings)"

Looking at the timestamps for these SIP messages
- It takes the proxy 0.8s to relay REGISTER request to SIP server
- It takes the proxy 1.8s to relay 200 OK to the softphone

These time durations appear to be very long.
What are the expected time durations for these relay times? What might be
causing relay times to be so large ?

Thanks in advance.

Regards,
Vikram.

> Hello,
>
> I am using an x-lite softphone to register with my SIP domain,
>
> (a) Without an outbound proxy - Registration is successful and takes
> about 3 seconds
> (b) With an outbound proxy - Registration is successful but takes nearly
> 15 seconds
> I briefly describe below the sequence of SIP messages while using the
> outbound proxy
>
> Register softphone -> proxy
> Register proxy -> SIP server
> Register softphone -> proxy
> 407 Proxy authentication reqd. SIP server -> proxy
> Register softphone -> proxy
> 407 Proxy authentication reqd. proxy -> softphone
> Register softphone -> proxy (With Digest response)
> Register proxy -> SIP server (With Digest response)
> 200 OK Sip server -> proxy
> Register softphone -> proxy (With Digest response)
>
> I am attaching a log with wireshark captures that show SIP messages
> exchanged between the SIP server,SIP proxy and the x-lite softphone. The
> log shows several messages being duplicated (REGISTER, 200 OK)
>
> 1) Why does the softphone continue to send REGISTER messages after
> receiving a 200 OK response ? (almost 15 repetitions of REGISTER after
> receiving 200 OK)
>
> 2) What is the reason for the delay in registration times with/without
> the proxy ?
>
> Thanks and Regards,
> Vikram.
>
>
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