Re: [SR-Users] BLF issue with Kamailio behind NAT

Mon, 28 Apr 2014 01:26:39 -0700 

Hello,
the phone has to send SUBSCRIBE for blf, kamailio cannot do anything for that. Maybe the phone is misconfigured. Do you have any logs from the phone saying what it tries and what doesn't work? 

Cheers,
Daniel

On 25/04/14 01:34, Errol Samuels wrote:

Hello All,


I have an integration with Kamailio and FusionPBX (Freeswitch) working 
great but I been trying to troubleshoot a BLF issue with Kamailio 
where the BLF seems to only work when Kamailio is on a Public IP 
rather than behind NAT.  The BLF works fine when we register directly 
with Freeswitch either on a Public IP or behind NAT.



Both Kamailio and FusionPBX (Freeswitch) are behind pfSense firewall 
on private IPs and registrations, Inbound and Outbound Calls etc are 
working fine.  Just this BLF issue giving me some grief.  The phone in 
question is a Yealink T20.


I made some SIP Traces and I noticed the following:

In the FS Message Header I see we have the SUBSCRIBE:

***** Begin Freeswitch trace****

Frame 13: 619 bytes on wire (4952 bits), 619 bytes captured (4952 bits)


Internet Protocol Version 4, Src: 192.168.1.138 (192.168.1.138), Dst: 
207.xx.xx.109 (207.xx.xx.109)

User Datagram Protocol, Src Port: x11 (6062), Dst Port: ca-2 (5065)
Session Initiation Protocol (REGISTER)

    Request-Line: REGISTER sip:testfs.mydomain.com:5065 
<http://testfs.mydomain.com:5065> SIP/2.0

    Message Header
        Via: SIP/2.0/UDP 192.168.1.138:6062;branch=z9hG4bK748715490

        From: "302" <sip:[email protected]:5065 
<http://sip:[email protected]:5065>>;tag=530545144
        To: "302" <sip:[email protected]:5065 
<http://sip:[email protected]:5065>>
        Call-ID: [email protected] 
<mailto:[email protected]>

        CSeq: 8 REGISTER

        Contact: <sip:[email protected]:6062 
<http://sip:[email protected]:6062>>
        Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, 
REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE

        Max-Forwards: 70
        User-Agent: Yealink SIP-T20P 9.72.0.30
        Expires: 300
        Allow-Events: talk,hold,conference,refer,check-sync
        Content-Length: 0

Frame 14: 698 bytes on wire (5584 bits), 698 bytes captured (5584 bits)


Internet Protocol Version 4, Src: 207.xx.xx.109 (207.xx.xx.109), Dst: 
192.168.1.138 (192.168.1.138)

User Datagram Protocol, Src Port: ca-2 (5065), Dst Port: x11 (6062)
Session Initiation Protocol (200)
    Status-Line: SIP/2.0 200 OK
    Message Header

        Via: SIP/2.0/UDP 
192.168.1.138:6062;branch=z9hG4bK748715490;received=2.xx.xx.187;rport=6062
        From: "302" <sip:[email protected]:5065 
<http://sip:[email protected]:5065>>;tag=530545144
        To: "302" <sip:[email protected]:5065 
<http://sip:[email protected]:5065>>;tag=j71FeN5gcBjDe
        Call-ID: [email protected] 
<mailto:[email protected]>

        CSeq: 8 REGISTER

        Contact: 
<sip:[email protected]:6062;received=2.xx.xx.187:6062>;expires=300

        Date: Thu, 24 Apr 2014 17:03:18 GMT

        User-Agent: 
FreeSWITCH-mod_sofia/1.2.23+git~20140419T040926Z~8a20da75ef~64bit
        Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, 
UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE

        Supported: timer, path, replaces
        Content-Length: 0

Frame 15: 509 bytes on wire (4072 bits), 509 bytes captured (4072 bits)


Internet Protocol Version 4, Src: 192.168.1.138 (192.168.1.138), Dst: 
10.22.110.9 (10.22.110.9)

User Datagram Protocol, Src Port: x11 (6062), Dst Port: ca-2 (5065)
Session Initiation Protocol (SUBSCRIBE)

    Request-Line: SUBSCRIBE sip:[email protected]:5065 
<http://sip:[email protected]:5065> SIP/2.0

    Message Header
        Via: SIP/2.0/UDP 192.168.1.138:6062;branch=z9hG4bK148600064

        From: "302" <sip:[email protected]:5065 
<http://sip:[email protected]:5065>>;tag=2146254460
        To: <sip:[email protected]:5065 
<http://sip:[email protected]:5065>>;tag=70uoBUVRvJyr

        Call-ID: [email protected] <mailto:[email protected]>
        CSeq: 2 SUBSCRIBE

        Contact: <sip:[email protected]:6062 
<http://sip:[email protected]:6062>>

        Accept: application/dialog-info+xml
        Max-Forwards: 70
        User-Agent: Yealink SIP-T20P 9.72.0.30
        Expires: 1800
        Event: dialog
        Content-Length: 0

****** End Freeswitch trace ********

In the Kamailio Header there is no SUBSCRIBE for the BLF.

***** Begin Kamailio trace****

Frame 17: 809 bytes on wire (6472 bits), 809 bytes captured (6472 bits)


Internet Protocol Version 4, Src: 192.168.1.138 (192.168.1.138), Dst: 
207.xx.xx.108 (207.xx.xx.108)

User Datagram Protocol, Src Port: x11 (6062), Dst Port: sip (5060)
Session Initiation Protocol (REGISTER)

    Request-Line: REGISTER sip:test.mydomain.com:5060 
<http://test.mydomain.com:5060> SIP/2.0

    Message Header
        Via: SIP/2.0/UDP 192.168.1.138:6062;branch=z9hG4bK1572502835

        From: "302" <sip:[email protected] 
<mailto:sip%[email protected]>>;tag=1877226231
        To: "302" <sip:[email protected] 
<mailto:sip%[email protected]>>

        Call-ID: [email protected] <mailto:[email protected]>
        CSeq: 3 REGISTER

        Contact: <sip:[email protected]:6062 
<http://sip:[email protected]:6062>>
        Authorization: Digest username="302", realm="test.mydomain.com 
<http://test.mydomain.com>", nonce="U1lHHFNZRfB7/5Lyb/Rz3p/xu26B1lpE", 
uri="sip:test.mydomain.com:5060 <http://test.mydomain.com:5060>", 
response="7687c7d3141d1898e63a1cc9538f05d7", algorithm=MD5
        Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, 
REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE

        Max-Forwards: 70
        User-Agent: Yealink SIP-T20P 9.72.0.30
        Expires: 300
        Allow-Events: talk,hold,conference,refer,check-sync
        Content-Length: 0

Frame 18: 496 bytes on wire (3968 bits), 496 bytes captured (3968 bits)


Internet Protocol Version 4, Src: 207.xx.xx.108 (207.xx.xx.108), Dst: 
192.168.1.138 (192.168.1.138)

User Datagram Protocol, Src Port: sip (5060), Dst Port: x11 (6062)
Session Initiation Protocol (200)
    Status-Line: SIP/2.0 200 OK
    Message Header

        Via: SIP/2.0/UDP 
192.168.1.138:6062;branch=z9hG4bK1572502835;rport=6062;received=2.xx.xx.187
        From: "302" <sip:[email protected] 
<mailto:sip%[email protected]>>;tag=1877226231
        To: "302" <sip:[email protected] 
<mailto:sip%[email protected]>>;tag=ff6b32c6b28b8954915484dd79f46b1c.fcdc

        Call-ID: [email protected] <mailto:[email protected]>
        CSeq: 3 REGISTER

        Contact: <sip:[email protected]:6062 
<http://sip:[email protected]:6062>>;expires=300;received="sip:2.xx.xx.187:6062"

        Server: kamailio (4.0.6 (x86_64/linux))
        Content-Length: 0

Frame 19: 316 bytes on wire (2528 bits), 316 bytes captured (2528 bits)


Internet Protocol Version 4, Src: 207.xx.xx.108 (207.xx.xx.108), Dst: 
192.168.1.138 (192.168.1.138)

User Datagram Protocol, Src Port: sip (5060), Dst Port: x11 (6062)
Session Initiation Protocol (OPTIONS)
    Request-Line: OPTIONS sip:2.xx.xx.187:6062 SIP/2.0
    Message Header
        Via: SIP/2.0/UDP 10.22.110.11:5060;branch=0

        From: sip:[email protected] 
<mailto:sip%[email protected]>;tag=uloc-53579917-4e9-89-0b632cbb-a8aa99c

        To: sip:2.xx.xx.187:6062

        Call-ID: [email protected] 
<mailto:[email protected]>

        CSeq: 1 OPTIONS
        Content-Length: 0

***** End Kamailio trace****

Anyone faced this issue or have any ideas?

regards,

Errol




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