NS1000 and SIP

[tmacdougall]

I am transitioning a client onto SIP trunks on an NS1000 with Legacy chassis. I am getting intermittent one way inbound audio and I'm not sure why. One second, the caller is there, the next they can hear me but I just get dead air. Trunks are routed through a Meraki router managed by an IT company and they have set the QoS to unlimited bandwidth, high priority, DCSP 43. My mirror traps show the audio dropping, but I'm not seeing a lot of packet loss. Just wondering if anyone has any ideas where I should hunt next.

 

[inlsp05]

check codecs-and NAT

PG4E

 

[obtsystems]

Is it a registered sip trunk or a peer. The peer needs port forwarding done

Other thing is make sure alg and sip helpers are off

 

[tmacdougall]

Codecs and NAT settings in PBX are identical to a working unit using the same SIP provider. Meraki does not do ALG or SIP helpers, and port forwarding is done. Problem is intermittent, and only on inbound audio, regardless of which endpoint originates the call.

 

[kizo]

Panasonic uses one IP address (MPR) for SIP protocol ( default 5060 UDP ), and second IP address for voice packets (RTP) to DSP.
Default RTP port for NS1000 is:
16000 - 16512 UDP to DSP 1-1
16512 - 17023 UDP to DSP 1-2
17024 - 17535 UDP to DSP 2-1
17536 - 18047 UDP to DSP 2-2
Maybe Meraki sends voice RTP packets to MPR IP address , not to DSP IP address?
Attached are similar problems with TDE, but problem is the same!

 

[tmacdougall]

Thanks for all the help. Turns out the client had installed a wireless printer and given it the same IP as my DSP resource. When the ARP went out from the Meraki, if the printer responded first, RTP traffic routed to it instead of the DSP card. If the phone system responded on the next one, it got the call back. Dumped the printer, problem disappeared.

 

[kizo]

In Utility/Error Log you have notification "Duplicate IP address" and Alarm lit red.
It is recommended to set PBX at a fixed IP address, out of DHCP area