Problem:
About 30% of incomming VoIP calls from our VoIP service provider cannot be setup
Diagnosis:
Cisco RV016 receive SIP INVITE from VoIP service provider packets but in ~30% cases does not forward them to LAN
What has been done:
- firmware upgrade (not help + broken IPSec)
- adding various firewall access rules
- test with another VoIP service providers (problem persists)
Setup:
Model: Cisco RV016 v. 3
Firmware: 4.2.1.02 (latest firmware is broken with IPSec-VPN Gateway-to-Gateway, so it can't be used in our environment)
Ports:
WAN1: ISP-1 (x.x.x.x)
WAN2: ISP-2 (y.y.y.y)
LAN1: IP-PBX (10.10.20.3)
Dual WAN: Intelligent Balancer
Bandwidth Management:
Type: Priority
Rules:
SIP UDP [UDP/5060~5068](Upstream)=>High=>WAN1 [Enabled]
SIP UDP [UDP/5060~5068](Downstream)=>High=>WAN1 [Enabled]
Forwarding:
SIP UDP [UDP/5060~5068]-> 10.10.20.3
Firewall:
Access rule:
Enable: Yes
Action: Allow
Service: SIP UDP [UDP/5060~5068]
Source Interface: WAN1
Source: 84.21.69.1 (VoIP ISP address)
Destination: 10.10.20.3
Time: Always
