[Freeswitch-users] freeswtich request on port 4242?

[Lawrence Conroy]

Hi There,
 Well, from here (in the UK) and now (10:00 UTC 140323), I've just checked Flowroute.com and can't see why your fS would connect to 82.45.148.209 or port 4242, but ...
For normal operation with external gateways, I'm not surprised that the port is not explicitly in your config.
Typically, where your box registers depends on DNS entries your external service has put into DNS.
[The gory details are at <http://www.ietf.org/rfc/rfc3263.txt>]

If your fS is registering with an external service, it will (unless disabled) do a lookup in DNS to find out the server to which it should register.
That lookup starts with a query on NAPTR records at <sipdomain>, which will spell out where to look for a SRV record (if it isn't the default place, which is _sip._udp.<sipdomain> or _sip._tcp.<sipdomain>), where <sipdomain> is the fully qualified domain name of the service to which your fS registers.
(Some services do have a NAPTR, some don't; if there isn't one, fS will assume the SRV is in the default place as above).
Next is a query for SRV records. If present in the gateway's zone, that DNS SRV record set will show the host **and port** of the servers that're running SIP for that domain.
fS will then attempt to make a sip connection to the "best" priority server and port, to register.

[If there isn't even a SRV there, the assumption is that the service is just using an A or AAAA record in the DNS at <sipdomain>, treated as a fully qualified domain name,]

Thus I wouldn't expect you to see anything with that port number explicitly in your config.

do a dig for NAPTR at <sipdomain>
do a dig for SRV on _sip._udp.<whatever the sip domain is in your flowroute sip gateway config>

I have no idea the SIP URI as which you register, but, if it were something like <sip:1234 at flowroute.com>, then the <sipdomain> would be flowroute.com. From here & now, for flowroute.com, I get:
-------------------
dig NAPTR flowroute.com              

; <<>> DiG 9.8.1 <<>> NAPTR flowroute.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12965
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 6, ADDITIONAL: 9

;; QUESTION SECTION:
;flowroute.com.			IN	NAPTR

;; ANSWER SECTION:
flowroute.com.		41837	IN	NAPTR	100 10 "s" "SIP+D2U" "" _sip._udp.flowroute.com.
flowroute.com.		41837	IN	NAPTR	102 20 "s" "SIP+D2T" "" _sip._tcp.flowroute.com.

;; AUTHORITY SECTION:
flowroute.com.		171437	IN	NS	d.ns.zerigo.net.
flowroute.com.		171437	IN	NS	c.ns.zerigo.net.
flowroute.com.		171437	IN	NS	f.ns.zerigo.net.
flowroute.com.		171437	IN	NS	e.ns.zerigo.net.
flowroute.com.		171437	IN	NS	b.ns.zerigo.net.
flowroute.com.		171437	IN	NS	a.ns.zerigo.net.

;; ADDITIONAL SECTION:
a.ns.zerigo.net.	12778	IN	A	64.27.57.11
a.ns.zerigo.net.	12778	IN	AAAA	2607:fc88:1001:1::4
c.ns.zerigo.net.	12778	IN	A	109.74.192.232
d.ns.zerigo.net.	12778	IN	A	174.36.24.250
d.ns.zerigo.net.	12778	IN	AAAA	2607:f0d0:1004:82::4
f.ns.zerigo.net.	85037	IN	A	174.37.229.229
f.ns.zerigo.net.	85037	IN	AAAA	2607:f0d0:3001:90::4
_sip._udp.flowroute.com. 42252	IN	SRV	10 10 5060 sip-nv1.flowroute.com.
_sip._udp.flowroute.com. 42252	IN	SRV	20 10 5060 sip-ca1.flowroute.com.

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Mar 23 10:08:46 2014
;; MSG SIZE  rcvd: 474
------------------

and ...
------------------
host sip-nv1.flowroute.com
sip-nv1.flowroute.com has address 216.115.69.144

host sip-ca1.flowroute.com
sip-ca1.flowroute.com has address 70.167.153.130
------------------

all the best,
  Lawrence


On 23 Mar 2014, at 06:32, Terry Barnum <terry at digital-outpost.com> wrote:
> While playing with freeswitch yesterday, Little Snitch reported
> that freeswitch immediately upon launch tries to establish a connection to 82.45.148.209 and 2001:503:ba3e::2:30 on port 4242.
> 
> A whois shows the ipv4 to be from Telewest Broadband in the UK.
> 
> The only port 4242 setting I find is in  conf/autoload_configs/event_multicast.conf.xml but for 225.1.1.1.
> 
> Blocking the connection prevents sofia from registering with flowroute so I'm curious what it is. I couldn't find any relevant search results.
> 
> FreeSWITCH Version 1.5.11b+git~20140301T003717Z~f2331de68b~64bit (git f2331de 2014-03-01 00:37:17Z 64bit)
> 
> Thanks,
> -Terry
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