NS700 giving busy 486 intermitantly

[YellowC]

Hi All,
Having a strange issue on a NS700 which has 12x Gamma SIP trunks
90% of incoming calls are working fine and we have had 5 or so in at the same time fine, however we are getting issue with about 10% of the calls getting busy from the system,
Our Trunk supplier Gamma have said they are getting Busy 486 from site, I have gotten busy from both a hunt group and a DISA Message, DSP usage dosen't look like a problem as it's max usage was 24 out of 61, would anyone know any other way the system could be giving busy?
Thanks

 

[obtsystems]

On the trace can you see the call coming in and being rejected if not try


If it is not a peer trunk and you register method you could reduce the registration timer to 600 or get port 5060 forward to the system address locked down to gamma register server address

 

[YellowC]

Thanks for the reply
I can see the call come in on the Pana trace, it says userbusy however, this is the case when it points to a hunt group or a DISA message.
In the past i've always opened 6000-40000 for SIP media on Pana and I've never had this issue however one of the other boys installed this system a few months ago and has used ports 16000-17023 which have worked fine until this fault was reported (unsure if this fault has always existed)

 

[YellowC]

Found the issue,
Both the SIP Called party was set High>Low as well as the Trunk Groups,

SIP Called Party Number Check Ability is set High > Low
Shelf Property - Virtual SIP Gateway

PBX Config. > 3.Group > 1.Trunk Group > 1.TRG Setting) High > Low CHANGE TO Low > High

Once I inverted one and done 100+ test calls I confirm it has solved the issue,
I normally always have my trunk group from low to high, I never installed the kit and didn't think anything of it,
Oh well sorted now!

 

[obtsystems]

Well spotted