28 Aug
2007
28 Aug
'07
6:56 a.m.
Eugene Prokopiev wrote:
Hi,
Can anybody tell some success story about using OpenSER as
Asterisk/CallWeaver frontend? I tried to googling first but where are no
detailed useful stories :(
OpenSER can come in quite handy to augment asterisk's SIP channel. I'm
combining asterisk with an openser instance on one host to act as our
emergency calling (911) border controller. Openser is used to rewrite
SIP pings issued by asterisk to check the SIP over VPN trunk to our 911
provider.
Openser is listening on port 5069,
(openser.cfg)
e.g. listen=udp:x.x.x.x:5069
and asterisk's SIP channel is configured with an outbound proxy like
(/etc/asterisk/sip.conf)
[911-provider]
type=peerInside openser's routing script you could
host=y.y.y.y
port=5069
outboundproxy=x.x.x.x
You could let openser listening on both virtual interfaces like
listen=udp:10.0.0.2:5060
listen=udp:10.0.0.3:5060
and use openser's force_send_socket() to select the interface for
outgoing SIP requests targeted for provider1/2.
http://www.openser.org/dokuwiki/doku.php/core-cookbook:1.2.x#force_send_soc…
Asterisk/CallWeaver would send all SIP traffic to one of openser's
listening sockets e.g. using the outboundproxy setting. The openser
routing script would be responsible for sending the requests to the
correct provider.
I haven't tested this scenario but I think it should work like that.
/Christian
Now I have CallWeaver (Asterisk fork) installed on Linux server which
connected to 2 different providers via one wan interface but 2 ip
addresses from one network, for example:
eth0 - 10.0.0.2/24 -> provider1(10.0.2.1)
- 10.0.0.3/24 -> provider1(10.0.3.1)
So, I need send SIP requests to provider1 from address 10.0.0.2/24 and
to provider2 from 10.0.0.3/24. This must be done because my internet
provider must account trafic on router 10.0.0.1 for 2 VoIP providers
separately and it's billing system can do it only by different source ip
addresses and can't do it by destination ip addresses.
I can separate SIP requests between 2 ip addresses with linux kernel
2.6.18 or higher by using ip_nat_sip iptables module and MARK/SNAT. But
this approach can't be used in OpenVZ virtial environment in which
CallWeaver must be used.
Is it possible to send SIP requests from CallWeaver via OpenSER and
modify them with OpenSER to replace source addresses in UDP headers and
SIP headers? How can I say CallWeaver to send SIP requests via OpenSER?
How can I implement this routing logic in OpenSER? Can anybody give me a
simple example?
--
Thanks,
Eugene Prokopiev
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