RV042 protocol binding for SIP and RTP (VoIP)

Hello everybody,
I have a RV042 with a DSL (WAN1) and cable (WAN2) internet connection in Load Balance Mode. The DSL provider also provides internet telephony when registered via his line. When I disable the WAN2 port, my IP phone successully registers with the registration server of the DSL provider. I also defined protocol bindings for SIP (port 5060) and RTP (ports 5004 to 5020) to be bound to WAN1. My IP phone is set up to listen on only these ports.
The rules are in detail:
SIP(UDP/5060~5060) -> "myPhoneIP"~"myPhoneIP" ("RegistrationServerP"~"RegistrationServerIP") WAN1 [Enabled]
SIP(UDP/5060~5060) -> "RegistrationServerIP"~"RegistrationServerIP" ("myPhoneIP"~"myPhoneIP") WAN1 [Enabled]
RTP(UDP/5004~5020) -> "myPhoneIP"~"myPhoneIP" ("RegistrationServerP"~"RegistrationServerIP") WAN1 [Enabled]
RTP(UDP/5004~5020) -> "RegistrationServerIP"~"RegistrationServerIP" ("myPhoneIP"~"myPhoneIP") WAN1 [Enabled]
With these protocol bindings in place when I re-enable WAN2, then after some time the phone reports "registration failed".
Do I need to set something else apart from protocol binding to force the VoIP traffic to go via WAN1?
Thanks for your help
Felix

Pardon my memory if I am mistaken, when configuring the protocol bind for the WAN port, there are 4 or 5 options. Service, which of course is 1~65535, source IP, in this scenario it should be the phone or PBX, whatever you're using. The destination IP should be 0.0.0.0 and interface is your desired WAN, WAN 1 or 2.
Example:
Wan 1- Cable       Wan 2 - Dsl
       |                              |
       | ________________ |
                      |
                  RV042-----------
              ____|                |
              |                     Computer 192.168.10.100
          Tele/PBX 192.168.10.250
On this example to route the Telephone / PBX to WAN 1
All services 1~65535
Source IP 192.168.10.250
Destination IP 0.0.0.0
Interface WAN 1
Please correct me if I am mistaken, I'm currently not at work due to the US holiday

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Unfortunately at the Small Business level of devices we do not have a device that will do as you need. I would recommend contacting our Enterprise Presales team to see if they can suggest a device that will meet your needs.
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! Last configuration change at 17:18:27 UTC Mon Feb 24 2014
version 15.1
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http://www.cisco.com/c/en/us/products/unified-communications/unified-border-element/index.html
https://supportforums.cisco.com/docs/DOC-17964
http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-border-element/99863-cube-config.html
GTG
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RV042 protocol binding for SIP and RTP (VoIP)

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