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SIP CISCO iqpbx 2000 & yealink sip-T22P phones

is there any reasan why the sip provisioning through a cisco router to a pbx be so troublesome over a 30mb leased line.
We intermittently get issues with sip voice being gargle like or dropping out altogether.

is this a NAT problem with SIP ?

any help would be greatly appreciated.

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1 Solution
Nat would cause one way audibility. If you don't notice high traffic issues on you leased line then it could be other reasons. Could you provide dump of call signalling and rtp when problem occurs? Also it would be good to provide hardware, software specification on your router and config file.
MaphewAuthor Commented:
Hi Vyaradaikin  thank you so much for coming back to me. Sorry i ve been delayed coming back to you other work issues.

I think they use a single ext ip and this is the issue with traffic at the port.

I have bben tasked with an old cisco 2901 router to build a router on a stick with 3 subnets as flat presently.

and to create a vpn tunnel to hosted desktop provider
voice on one clan
and data on a new native clan to include a windows dhcp server just for computers
i have to create a dhcp pool  for  voice vlan

the pbx will now have own external ip dedicated
MaphewAuthor Commented:
I gave the PBX own dedicated ip and provider configured QoS on Juniper router.
MaphewAuthor Commented:
the 3rd psrty line provider gave me a new router and added qos
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