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4 posts

Wannabe Geek


  Reply # 1983969 27-Mar-2018 08:18
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@meow

 

I spoke too soon, the problem with receiving incoming calls is still there. 

 

It seemed that setting the Register Expires to a lower value made as difference in terms of how long the system remained stable, so I will continue to play around with that to see if there is a sweet spot

 

 


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  Reply # 1983981 27-Mar-2018 08:59
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Register expires shouldn't need to be any lower. If you have a poorly configured router that doesn't keep the NAT pinhole open long enough for UDP it could result in the inbound calls not connecting.

 

 

 

 


 
 
 
 


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141 posts

Master Geek
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  Reply # 1983984 27-Mar-2018 09:05
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sbiddle:

 

Register expires shouldn't need to be any lower. If you have a poorly configured router that doesn't keep the NAT pinhole open long enough for UDP it could result in the inbound calls not connecting.

 

 

 

 

Here here! This is precisely the cause of that problem (intermittent failure for inbound-call signalling to get through).

 

The fix is to either increase the NAT table timeout in the firewall, or reduce the keepalive interval in the ATA.

 

 


4 posts

Wannabe Geek


  Reply # 1984649 28-Mar-2018 08:03
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@Meow

 

I changed the following three settings:

 

Voice > Line1[2] > NAT Settings > NAT Keep Alive Enable:  Yes

 

(This is suggested by a number of overseas providers and is relevant to the previous comments in this thread)

 

Voice > SIP > NAT Support Parameters > Insert VIA rport:  Yes

 

and

 

Voice > SIP > NAT Support Parameters > Handle VIA rport:  Yes

 

My connection has been stable for 24 hours.

 

----

 

I have also read a suggestion that

 

Voice > Line1[2] > Proxy and Registration > Use DNS SRV: Yes

 

can also help in certain circumstances

 

----

 

I will also dial the Register Expires back up to minimise my impact on the ISP.

 

 

 

I hope this helps

 

 


4 posts

Wannabe Geek


  Reply # 1984884 28-Mar-2018 12:56
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@sbiddle @speed

 

My apologies for offering incorrect suggestions which negatively impact service providers or break the 'fair use of resources' rule that we should all abide by.

 

I joined up because I stumbled across a question from somebody who - like me - just wanted their phone to work and for whom there is very little concrete information available from their ISP or anyone else. As I had had some (incomplete) success I thought it appropriate to share.

 

I am not a network engineer, and have very little knowledge of VOIP or CISCO SPA configs. I also use a simple home router which gives no control over things like NAT tables, resources or timeouts. I completely understand why IT Professionals cringe when they see some of the things people suggest in their ignorance, but I hadn't realised that input from amateurs is not appropriate for these particular forums, I'll make sure I don't add any more to the pile.


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Master Geek
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  Reply # 1984935 28-Mar-2018 13:52
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@happynut

 

Your previous post indicated you've had 24+ hrs of stability now. My guess is that this is because you enabled the NAT keepalives on the ATA.

 

 

 

Once the OP gets his registration issue resolved then I suspect he'll need the same keep-alive setting enabled. So your input is valuable to him I would have thought!

 

 

 

 




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Geek
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  Reply # 1985577 29-Mar-2018 18:23
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Thanks to the config help here I was able to get it registered!


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