X-Lite SIP Phone registration with Astersik study

Asterisk Asterisk Support
1

Hi,

I have to study SIP protocol and first of all i’d like to understand SIPPhone registration.

If i read SIP documentation, registration look like :

softphone -----> Registar : Request: REGISTER sip:mrim.edu
Registar -----> softphone : Status: 200 OK (1 Binding)

But, When I capture traffic with ethereal between X-Liste SoftPhone and Asterisk I got :

1 - softphone -----> Registar : Request: REGISTER sip:mrim.edu
2 - Registar -----> softphone : Status: 100 Trying (1 binding)
3 - Registar -----> softphone : Status: 401 Unauthorized (1 binding)
4 - softphone -----> Registar : Request: REGISTER sip:mrim.edu
5 - Registar -----> softphone : Status: 100 Trying (1 binding)
6 - Registar -----> softphone : Request: OPTIONS sip:102@192.168.0.4:8012;
7 - Registar -----> softphone : Status: 200 OK (1 Binding)
8 - softphone -----> Registar : Status: 200 OK
9 - softphone -----> Registar : Request: SUBSCRIBE sip:102@mrim.edu
10 - Registar -----> softphone : Status: 401 Unauthorized
11 - softphone -----> Registar : Request: SUBSCRIBE sip:102@mrim.edu
12 - Registar -----> softphone : Status: 489 Bad Event

Softphone : 192.168.0.4
Registar Asterisk 192.168.0.6

We effectively find REGISTER (Number 4) and OK (Numbre 7) but what about the othe packets ?

Thanks a lot for your answers.

2

options probably means you have qualify=yes set. it pings the phone with an options packet every now and then to make sure it’s still there. ignore it or set qualify=no

the others are the softphone trying to subscribe to extensions for BLF. search voip-info.org for BLF or the ‘hint’ extension for more info on htat. BLF is making the persons speed dial light up when they’re on the phone.