On 02/02/14 14:42, Markus Reschke wrote:
Hi!
My telco is Deutsche Telekom and they got about 30 SIP servers right
now. Currently I've set up a template for incoming calls in sip.conf
and added each SIP server by it's IP address like this:
[DTAG-in-1](DTAG-in-template)
host=217.0.16.103
...
[DTAG-in-30](DTAG-in-template)
host=217.0.20.99
I've done that to improve security and to be able to assign all calls
coming in via Deutsche Telekom to a dedicated dialplan context.
Unfortunately this approach is not scalable and it's a PITA to
maintain a list of server IP addresses since Deutsche Telekom will get
more SIP servers in the future. They've started to migrate the classic
POTS/ISDN network to VoIP, the goal is get it done by 2016. Customers
with DSL get VoIP directly, i.e. they need SIP phones or a SIP PBX,
and customers with a phone line only are converted by the MSAN. And
they don't provide an official list of the SIP servers :-( By some
reverse engineering I found out that all SIP servers are within a
specific subnet. Is there any way to match peers by subnet(s) instead
of FQDNs or single IP addresses? If not, it would be a feature really
needed to be able to cope with telcos running multiple or tons of SIP
servers.
cu, Markus
You could consider making use of opensips. We use it for inbound sip
connections and its fairly easy to get it to perform a database lookup
against a connecting IP address and pull out a record and pass that onto
Asterisk using a custom header. Asterisk can then trust connections from
opensips and you can read in the custom header and have the dialplan
decide what to do based upon the value.
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