We have dual wan configuration setup on Mikrotik. We are using this router for polycom ip phones. The problem is after the fail-over, the phone never register to ISP2. I run Wireshark and found that while the phone is using ISP2 to talk to the server with a source address of ISP1. In return the server is sending back the ok request to ISP1 which is currently down. Can somebody help me this why Mikrotik is sending the wrong source address ISP1 instead of correct source address ISP2 at the time of fail-over?
Please find the route and ISP config below,
[Voice router] > /ip route print detail
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit
0 S dst-address=0.0.0.0/0 gateway=10.1.1.1 gateway-status=10.1.1.1 unreachable distance=1 scope=30
target-scope=10
1 A S dst-address=0.0.0.0/0 gateway=204.48.121.1,204.9.56.33
gateway-status=204.48.121.1 reachable via ether2-ISP2,204.9.56.33 unreachable check-gateway=ping
distance=1 scope=30 target-scope=10
2 S dst-address=0.0.0.0/0 gateway=204.48.121.1 gateway-status=204.48.121.1 reachable via ether2-ISP2
distance=2 scope=30 target-scope=10
3 S dst-address=10.1.1.1/32 gateway=208.64.155.4 gateway-status=208.64.155.4 unreachable check-gateway=ping
distance=1 scope=10 target-scope=10
4 S dst-address=10.1.1.1/32 gateway=204.48.123.4 gateway-status=204.48.123.4 unreachable check-gateway=ping
distance=1 scope=10 target-scope=10
5 ADC dst-address=192.168.88.0/24 pref-src=192.168.88.1 gateway=bridge-LAN gateway-status=bridge-LAN reachable
distance=0 scope=10
6 DC dst-address=204.9.56.32/30 pref-src=204.9.56.34 gateway=ether1-ISP1 gateway-status=ether1-ISP1 unreachable
distance=255 scope=10
7 ADC dst-address=204.48.121.0/29 pref-src=204.48.121.2 gateway=ether2-ISP2 gateway-status=ether2-ISP2 reachable
distance=0 scope=10
8 S dst-address=204.48.123.4/32 gateway=204.9.56.33 gateway-status=204.9.56.33 unreachable distance=1 scope=10
target-scope=10
9 S dst-address=208.64.155.4/32 gateway=204.9.56.33 gateway-status=204.9.56.33 unreachable distance=1 scope=10
target-scope=10