[Serusers] How to handle redirect with sipbroker?

[Roger Lewau]

I dont know if any of you use the SIPBroker service to do multi enum
lookups, but I'm hoping there are some on this list who do.
 
I have been using SIPBroker for dialing with sip codes only so far and did
my enum lookups on my own. But now, I decided to set ser up to try sipbroker
first for all external calls and then fall back to my different gateways if
no route can be found via SIPBroker.
 
SIPBroker, in prinicpal, works like this.
 
I send an Invite for any enum number to SIPBroker.
If sipbroker finds a route for that number to another voipprovider it will
proxy the call to the found provider.
If sipbroker can not find a route, it will reply with a redirect of the call
to my self and I am supposed to handle the call setup my self, through my
gateways.
 
My question is how to handle this redirect message?
Any one who has a working failure route to handle this situation, and are
willing to share?
 
Here is an actual SIP conversation, initiated from Asterisk via SER, of a
failed Enum lookup through SIPBroker:
 
#
U 212.247.91.XXX:5060 -> 24.196.79.163:5060
INVITE sip:4640240252 at sipbroker.com SIP/2.0.
Record-Route: <sip:212.247.91.XXX;ftag=as5e811304;lr=on>.
Via: SIP/2.0/UDP 212.247.91.XXX;branch=z9hG4bK7307.c7d88007.0.
Via: SIP/2.0/UDP 212.247.91.XXZ:5060;branch=z9hG4bK05f7cabc;rport=5060.
From: "Roger Lewau" <sip:330000 at sip.serverhallen.com>;tag=as5e811304.
To: <sip:240252 at sip.serverhallen.com>.
Contact: <sip:330000 at 212.247.91.XXZ>.
Call-ID: 6877d50b1343fac25403e06f4a83c280 at sip.serverhallen.com.
CSeq: 103 INVITE.
User-Agent: Asterisk PBX.
Max-Forwards: 16.
Date: Sat, 29 Jul 2006 22:42:23 GMT.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY.
Content-Type: application/sdp.
Content-Length: 336.
.
v=0.
o=root 850 851 IN IP4 212.247.91.XXZ.
s=session.
c=IN IP4 212.247.91.XXZ.
t=0 0.
m=audio 34852 RTP/AVP 0 8 18 97 3 101.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:97 iLBC/8000.
a=rtpmap:3 GSM/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
 
##
U 24.196.79.163:5060 -> 212.247.91.XXX:5060
SIP/2.0 300 Redirect.
Via: SIP/2.0/UDP 212.247.91.XXX;branch=z9hG4bK7307.c7d88007.0.
Via: SIP/2.0/UDP 212.247.91.XXZ:5060;branch=z9hG4bK05f7cabc;rport=5060.
From: "Roger Lewau" <sip:330000 at sip.serverhallen.com>;tag=as5e811304.
To:
<sip:240252 at sip.serverhallen.com>;tag=b27e1a1d33761e85846fc98f5f3a7e58.fe4c.
Call-ID: 6877d50b1343fac25403e06f4a83c280 at sip.serverhallen.com.
CSeq: 103 INVITE.
Contact: sip:4640240252 at sip.serverhallen.com.
Server: Sip EXpress router (0.9.4 (i386/linux)).
Content-Length: 0.
Warning: 392 24.196.79.163:5060 "Noisy feedback tells:  pid=15326
req_src_ip=212.247.91.XXXreq_src_port=5060
in_uri=sip:4640240252 at sipbroker.com
out_uri=sip:4640240252 at sip.serverhallen.com via_cnt==2".
.
 
#
U 212.247.91.XXX:5060 -> 24.196.79.163:5060
ACK sip:4640240252 at sipbroker.com SIP/2.0.
Via: SIP/2.0/UDP 212.247.91.237;branch=z9hG4bK7307.c7d88007.0.
From: "Roger Lewau" <sip:330000 at sip.serverhallen.com>;tag=as5e811304.
Call-ID: 6877d50b1343fac25403e06f4a83c280 at sip.serverhallen.com.
To:
<sip:240252 at sip.serverhallen.com>;tag=b27e1a1d33761e85846fc98f5f3a7e58.fe4c.
CSeq: 103 ACK.
User-Agent: Sip EXpress router(0.9.3 (i386/freebsd)).
Content-Length: 0.
.
 
 
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