22 Feb
2005
22 Feb
'05
11:14 p.m.
Hi All,
I am facing problem to get SER to do a SRV lookup. I have the following
scenario...
Step 1:
SIP UA1 registers with SER (testdomain.com) with contact address
user(a)testdomain.com
SIP UA2 registers with SER (testdomain.com) with contact address
user(a)testdomain.com
Step 2:
SIP UA3 calls user(a)testdomain.com
Problem
I would expect SER to do a DNS SRV lookup on testdomain.com and get
sip1.testdomain.com and sip2.testdomain.com. Unfortunately, SER only
does A and AAAA query. (verified via ethereal) and does not do SRV
lookup. How can I make it do SRV lookup ? I am using the default ser.cfg
file.
DNS entries
_sip._udp.testdomain.com. 3600 IN SRV
0 1 5060 sip1.testdomain.com.
_sip._udp.testdomain.com. 3600 IN SRV
0 1 5060 sip2.testdomain.com.
I am trying to do load balancing but the SRV lookup failure has got me
stuck. Any pointers would be really appreciated.
Thanks,
Chetan
24 Feb
24 Feb
10:04 a.m.
Are you absolutely sure the contact address is stored as user(a)testdomain.com
and not user(a)some.ip.address in the location table? I'm sure t_relay() will
do SRV lookup, with one condition. The URI should be in the form
sip:user@testdomain.com, with no port specified. If the URI does have the
port included like sip:user@testdomain.com:5060, then SER will not do SRV
lookup.
Most UAs I saw use IP address in contact header and that means no SRV
lookup. Better check yours with serctl ul show.
You can verify the SRV lookup with the following script.
loadmodule "/usr/local/lib/ser/modules/tm.so"
route{
rewritehost("stupid.domain");
t_relay();
}
The ethereal output will show SRV lookup.
Zeus
-----Original Message-----
From: serusers-bounces(a)lists.iptel.org
[mailto:serusers-bounces@lists.iptel.org] On Behalf Of Gandhi, Chetan
Sent: Wednesday, 23 February 2005 9:15 AM
To: serusers(a)lists.iptel.org
Subject: [Serusers] DNS SRV lookup issue
Hi All,
I am facing problem to get SER to do a SRV lookup. I have the
following scenario.
Step 1:
SIP UA1 registers with SER (testdomain.com) with contact
address user(a)testdomain.com
SIP UA2 registers with SER (testdomain.com) with contact
address user(a)testdomain.com
Step 2:
SIP UA3 calls user(a)testdomain.com
Problem
I would expect SER to do a DNS SRV lookup on testdomain.com
and get sip1.testdomain.com and sip2.testdomain.com.
Unfortunately, SER only does A and AAAA query. (verified via
ethereal) and does not do SRV lookup. How can I make it do
SRV lookup ? I am using the default ser.cfg file.
DNS entries
_sip._udp.testdomain.com. 3600 IN
SRV 0 1 5060 sip1.testdomain.com.
_sip._udp.testdomain.com. 3600 IN
SRV 0 1 5060 sip2.testdomain.com.
I am trying to do load balancing but the SRV lookup failure
has got me stuck. Any pointers would be really appreciated.
Thanks,
Chetan
7:43 p.m.
Thanks Zeus.
The problem is solved. In the Contact address I had the port well i.e.
user@testdomain.com:5060. Once I removed the port, the SER did do SRV
lookup.
Just to learn from it, do you if this a SIP/SRV protocol nuance or a
SER implementation issue ?
thanks,
Chetan
On Thu, 24 Feb 2005 20:04:03 +1100, Zeus Ng <zeus.ng(a)isquare.com.au> wrote:
Are you absolutely sure the contact address is stored
as user(a)testdomain.com
and not user(a)some.ip.address in the location table? I'm sure t_relay() will
do SRV lookup, with one condition. The URI should be in the form
sip:user@testdomain.com, with no port specified. If the URI does have the
port included like sip:user@testdomain.com:5060, then SER will not do SRV
lookup.
Most UAs I saw use IP address in contact header and that means no SRV
lookup. Better check yours with serctl ul show.
You can verify the SRV lookup with the following script.
loadmodule "/usr/local/lib/ser/modules/tm.so"
route{
rewritehost("stupid.domain");
t_relay();
}
The ethereal output will show SRV lookup.
Zeus
-----Original Message-----
From: serusers-bounces(a)lists.iptel.org
[mailto:serusers-bounces@lists.iptel.org] On Behalf Of Gandhi, Chetan
Sent: Wednesday, 23 February 2005 9:15 AM
To: serusers(a)lists.iptel.org
Subject: [Serusers] DNS SRV lookup issue
Hi All,
I am facing problem to get SER to do a SRV lookup. I have the
following scenario.
Step 1:
SIP UA1 registers with SER (testdomain.com) with contact
address user(a)testdomain.com
SIP UA2 registers with SER (testdomain.com) with contact
address user(a)testdomain.com
Step 2:
SIP UA3 calls user(a)testdomain.com
Problem
I would expect SER to do a DNS SRV lookup on testdomain.com
and get sip1.testdomain.com and sip2.testdomain.com.
Unfortunately, SER only does A and AAAA query. (verified via
ethereal) and does not do SRV lookup. How can I make it do
SRV lookup ? I am using the default ser.cfg file.
DNS entries
_sip._udp.testdomain.com. 3600 IN
SRV 0 1 5060 sip1.testdomain.com.
_sip._udp.testdomain.com. 3600 IN
SRV 0 1 5060 sip2.testdomain.com.
I am trying to do load balancing but the SRV lookup failure
has got me stuck. Any pointers would be really appreciated.
Thanks,
Chetan
_______________________________________________
Serusers mailing list
serusers(a)lists.iptel.org
http://lists.iptel.org/mailman/listinfo/serusers
25 Feb
25 Feb
4:57 a.m.
For that, I don't know. However, I would say SER is doing the right thing on
RR SRV lookup but that's just my opinion.
The purpose of SRV record is to help application finding
1) IP address
2) port number
3) priority (weight) of the service
As you have already specified the port number, the RR SRV lookup would
become redundant. What happen if the port number in the RR record is
different to what you specified? There must be a reason to specify the port
number in URI and SER should honour that.
Zeus
-----Original Message-----
From: Chetan Gandhi
Sent: Friday, 25 February 2005 5:44 AM
To: serusers(a)lists.iptel.org
Cc: Zeus Ng
Subject: Re: [Serusers] DNS SRV lookup issue
Thanks Zeus.
The problem is solved. In the Contact address I had the port
well i.e. user@testdomain.com:5060. Once I removed the port,
the SER did do SRV lookup.
Just to learn from it, do you if this a SIP/SRV protocol
nuance or a SER implementation issue ?
thanks,
Chetan
On Thu, 24 Feb 2005 20:04:03 +1100, Zeus Ng
<zeus.ng(a)isquare.com.au> wrote:
Are you absolutely sure the contact address is
stored as
user(a)testdomain.com and not user(a)some.ip.address in the location
table? I'm sure t_relay() will do SRV lookup, with one
condition. The
URI should be in the form
sip:user@testdomain.com, with no port
specified. If the URI does have the port included like
sip:user@testdomain.com:5060, then SER will not do SRV lookup.
Most UAs I saw use IP address in contact header and that
means no SRV
lookup. Better check yours with serctl ul show.
You can verify the SRV lookup with the following script.
loadmodule "/usr/local/lib/ser/modules/tm.so"
route{
rewritehost("stupid.domain");
t_relay();
}
The ethereal output will show SRV lookup.
Zeus
> -----Original Message-----
> From: serusers-bounces(a)lists.iptel.org
[mailto:serusers-bounces@lists.iptel.org]
> On Behalf Of Gandhi, Chetan
> Sent: Wednesday, 23 February 2005 9:15 AM
> To: serusers(a)lists.iptel.org
> Subject: [Serusers] DNS SRV lookup issue
>
>
> Hi All,
>
>
>
> I am facing problem to get SER to do a SRV lookup. I have the
> following scenario.
>
>
>
> Step 1:
>
> SIP UA1 registers with SER (testdomain.com) with contact address
> user(a)testdomain.com
>
> SIP UA2 registers with SER (testdomain.com) with contact address
> user(a)testdomain.com
>
>
>
> Step 2:
>
> SIP UA3 calls user(a)testdomain.com
>
>
>
> Problem
>
> I would expect SER to do a DNS SRV lookup on
testdomain.com and get
Unfortunately, SER only
> does A and AAAA query. (verified via
> ethereal) and does not do SRV lookup. How can I make it do SRV
> lookup ? I am using the default ser.cfg file.
>
>
>
>
>
> DNS entries
>
> _sip._udp.testdomain.com. 3600 IN
> SRV 0 1 5060 sip1.testdomain.com.
>
> _sip._udp.testdomain.com. 3600 IN
> SRV 0 1 5060 sip2.testdomain.com.
>
>
>
> I am trying to do load balancing but the SRV lookup
failure has got
me stuck.
Any pointers would be really appreciated.
Thanks,
Chetan
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Serusers mailing list
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days inactive
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days old
3 comments
3 participants
participants (3)
-
Chetan Gandhi -
Gandhi, Chetan -
Zeus Ng