[asterisk-users] SIP DNS SRV

[Gareth Blades]

Jonas Kellens wrote:
> On 11/09/2010 02:12 PM, Gareth Blades wrote:
>> Jonas Kellens wrote:
>>    
>>> On 11/08/2010 09:50 PM, Jonas Kellens wrote:
>>>      
>>>> Hello,
>>>>
>>>> SIP DNS SRV records are not working.
>>>>
>>>> My Grandstream uses the SRV records to find the first Asterisk server
>>>> to register to. This works.
>>>>
>>>> But when I shut down the Asterisk proces on server 1 and I restart my
>>>> GXP 2010, the phone does not register to server 2... No mather how
>>>> long I wait, there is no registration coming in...
>>>>
>>>> When I start the Asterisk proces again on server 1, then here
>>>> registration comes in.
>>>>
>>>>
>>>> Kind regards,
>>>> Jonas.
>>>>        
>>> More info :
>>>
>>> [Jonas at jonas ~]$ host -t srv _SIP._udp.sip10.domain.tld
>>> _SIP._udp.sip10.domain.tld has SRV record 25 10 5060 sip2.domain.tld.
>>> _SIP._udp.sip10.domain.tld has SRV record 5 10 5060 sip1.domain.tld.
>>>
>>>      
>> It sounds like the grandstream phones are not fully compliant with the
>> SRV standard. They are probably just looking for the lowest priority
>> entry and hardcoding that to be used all the time internally.
>>
>> If you restart the phone does it work?
>> It might try the 25 priority entry if it cannot initially contact the
>> primary server.
>>    
> 
> The way I test it :
> 
> - Grandstream turned off.
> - Stop asterisk server1 (/sbin/service asterisk stop)
> - Turn on Grandstream (power up)
> 
> Conclusion :
> Grandstream does not register. No register coming in on server2.
> 
> Finally :
> - Start Asterisk again on server1 (/sbin/service asterisk start)
> 
> Conclusion :
> Grandstream registers to server1.
> 
> Jonas.
> 

Then it looks like the Grandstream phone dont fully support DNS SRV. 
maybe a firmware update will fix it.