Hi Asif,

I'm not sure what you're trying to do here. Can you please clarify?

Is it that you have a domain 'a.cw-ngv.com', and you want:

*         Requests to 'a.cw-ngv.com' to be routed equally to 'b.cw-ngv.com', 
'c.cw-ngv.com', 'd.cw-ngv.com', 'e.cw-ngv.com', 'f.cw-ngv.com'

*         If any of the b-f domains are unresponsive, then don't route requests 
to them.

If this is the case, you can do this using SIP NAPTR/SRV. The docs to set this 
up are at: 
https://github.com/Metaswitch/clearwater-docs/wiki/Clearwater-DNS-Usage

In short, you will want to set up an enum rule such that all requests that you 
want to go to the SIP trunks are sent to 'a.cw-ngv.com' - e.g.:

*<number range to route to> IN NAPTR 1 1 "u" "E2U+sip" 
"!(^.*$)!sip:\\[email protected]!" .

You then need to add DNS records for your SIP trunks, e.g.:


; Per-node records

b.cw-ngv.com           IN A     1.0.0.1

c.cw-ngv.com           IN A     1.0.0.2

(and so on for d-f)

;

; Cluster A and AAAA records

a.cw-ngv.com           IN A     1.0.0.1

a.cw-ngv.com           IN A     1.0.0.2

;

; NAPTR and SRV records

a.cw-ngv.com                  IN NAPTR 1 1 "S" "SIP+D2T" "" 
_sip._<tcp/udp>.a.cw-ngv.com

_sip._<tcp/udp>.a.cw-ngv.com  IN SRV   0 0 <port> b.cw-ngv.com

_sip._<tcp/udp>.a.cw-ngv.com  IN SRV   0 0 <port> c.cw-ngv.com

;

The SIP resolver code will greylist any SIP trunks that are unresponsive for 30 
seconds (meaning that they will only send requests to that trunk if there are 
no other options).

Ellie

Ellie


From: [email protected] 
[mailto:[email protected]] On Behalf Of Mohammad 
Asif Khan
Sent: 09 April 2014 15:19
To: [email protected]
Subject: [Clearwater] SIP multiple trunk

Hi

we want to configure 5 sip trunk with one uplink provider.so what will be the 
regex in enum.jason,
and what if one of the trunk is down than how the traffic will routed to other 
trunk

Asif

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