[Users] Re: OpenSER not sending responses to IP in via header

Daniel-Constantin Mierla daniel at voice-system.ro
Thu Mar 22 19:13:36 CET 2007



On 03/22/07 19:26, Tim Madorma wrote:
> Sorry all, I just needed to set reply_to_via=1. I should have checked
> the cookbook before posting - now it works.
ok -- I assume you don't deal with NAT cases. reply_to_via is set to 0 
because NAT is very common and won't work fi reply to via is on.

Cheers,
Daniel

>
> Tim
>
> On 3/22/07, Tim Madorma <tmadorma at gmail.com> wrote:
>> Hi,
>>
>> I have an OpenSER behind a BIG IP load balancer. The scenario is as 
>> follows:
>>
>> 1) The UAC will initiate the call with an INVITE that has the REQ URI
>> set to the IP of the BIG IP.
>>
>> 2) The OpenSER has an alias configured for the IP address of the BIG
>> IP so it receives the incoming INVITE, but when it sends a 100
>> response, it does not send it to the UAC address that is specified in
>> the VIA header, rather it sends it to the source IP (which is the IP
>> of the BIG IP load balancer). This is undesirable.
>>
>> 3) After the UAS receives the proxied INVITE, it responds with a 100,
>> then answers with a 200.
>>
>> 4) When the OpenSER receives the 100, it forwards this back to the BIG
>> IP load balancer! First, I am surprised that it fowards a 100 at all,
>> and second it is undesirable to send any responses to the BIG IP load
>> balancer since the via header indicates the IP of the UAC.
>>
>> 5) When the OpenSER receives the 200, it forwards it back to the BIG
>> IP also.. again, I don't know why it isn't sending to the IP address
>> of the via - which is that of the UAC.
>>
>> Any suggestions would be most helpful.
>>
>> Here are my related openser.cfg settings:
>>
>> # LOCAL IP ADDRESS AND PORTS
>> listen=65.185.232.62:5061
>> listen=65.185.232.62:5062
>> listen=65.185.232.62:5063
>>
>> # IP ADDRESS AND PORTS OF THE BIG IP LOAD BALANCER
>> alias=65.185.233.104:5061
>> alias=65.185.233.104:5062
>> alias=65.185.233.104:5063
>>
>> thanks,
>> Tim
>>
>
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