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VoiP SIP trunk to Cisco RV345 and SG200-50 Switch epic Fail

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Andre Savoie

Im having some serious trouble with VoiP phones that are sip trunked over the internet. I.E. we do not have an On Premises PBX. Every thing from the provisioning to the calls is done over the internet through a white labeled 3rd party. Telus is the company we have the service agreement with but they are using white labeled services from Ringcentral.com they don't have any control over the network themselves.

What keeps happening is the phones drop the link to sip.ringcentral.com and stop working then come back up 10-20 seconds later this was happening way more frequently before I opened some ports in my firewall and changed a few of the QoS settings but this is still dropping. I have a Cisco RV345 router and a Cisco SG200-50 switch. I use a Rogers Gigabit Static CODA modem for most of my internet traffic but then I have a Cradlepoint LTE backup modem daisy chained with a Hitron CGN3ACR pushing a 150 megabit connection.

I have the default route set to send all traffic out WAN1 which is the Static Gigabit modem so 0.0.0.0 0.0.0.0 is sent to .... static ip next hop. This has a metric of 2 because I am also policy routing and static routing all my voip traffic out the CGN3ACR modem because the gigabit modem has issues sometimes with piling up because of bad firmware.

So what I am saying is I have set my QoS traffic on the switch to DSCP and forced services related to the VoiP to have the same DSCP number as the VoiP traffic which is in Q4 the priority queue.

Then I set all the traffic to route out the modem I want it to route out of to eliminate the bs that comes with the static IP modem. I am also policy routing all the traffic on the wan page out the WAN2 Port which is my Hitron CGN3ACR and I have static routes for all the supernets that are required by the customer.

The damn phones are still loosing their connection to sip.ringcentral.com this is a real frustrating head banger for me its giving me a headache and If anyone has any input they care to share with my about the structure of my network or my setup please feel free to DM me. or post a reply

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