[asterisk-users] Re: Input on Dundi

[David Thomas]

On 12/12/06, JR Richardson <jmr.richardson at gmail.com> wrote:
> > 1.)  When a registration server fails there doesn't seem to be an easy
> > way to have clients automatically register to a new server. (our
> > clients are mostly other asterisk boxes.) To solve this we are
> > considering using DNS failover.
>
> When registering with an Asterisk server to an Asterisk cluster of
> servers, for the purpose of traversing a NAT or something else (to
> solve a problem where direct contact cannot be performed), I would
> suggest doing multiple registration to two registration servers, using
> different names.
>
> Like
> registration [name1] to registration server 1
> registration [name2] to registration server 2
>
> in the outgoing dilaplan
>
> exten => _NXXNXXXXXX,1,Dial(IAX2/server1......|j)
> exten => _NXXNXXXXXX,102,Dial(IAX2/server2......
>
> so if server one is not there the call will jump to the next server
>
> or
>
> exten => _NXXNXXXXXX,1,Dial(IAX2/server1&IAX2/server2.............
>
> first server to answer will get the call.
>
> you can do something similar calling from the cluster to the end Asterisk server
> dundi lookup for [name1] if not available lookup [name2]
>
> >
> > 2.)  If you plan to do any direct routing using the fullcontact
> > address like what is shown in JR's whitepaper, you may find that
> > fullcontact sometimes contains private network addresses. This makes
> > it impossible to route inbound calls directly to the client.
> >
> I recently started pulling the ipaddress and port from the database
> instead of using the fullcontact field.  Aaron Daniels helped me to
> get the realtime query working instead of using the mysql connect
> statements.
>
> [lookupmysql]
> include => invalid
>
> exten => _X.,1,RealTime(sippeers|name|${EXTEN}|DN_)
> exten => _X.,2,GotoIf($["${DN_ipaddr}" = ""]?${EXTEN},105:${EXTEN},3)
> exten => _X.,3,Set(directdial=${EXTEN}@${DN_ipaddr}:${DN_port})
> exten => _X.,4,Dial(SIP/${directdial},15,rj)
> exten => _X.,5,Macro(sendtovm,${EXTEN})
> exten => _X.,6,Hangup
>
> exten => _X.,105,Macro(sendtovm,${EXTEN})
> exten => _X.,106,Hangup
>
> The RealTime command pulls all the entire record from the database and
> prepends all the fields with the last argument (here is have DN_)  so
> when the record is pulled, all the records info is available as a
> variable like DN_port and DN_ipaddr.
>
> This is a really cool command.  Hope this helps.

Wow, thanks for the examples JR. This is exactly what I needed. I was
not aware of the RealTime command. That will be very useful.

David