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WAN Failover and SIP telephony

Hi,
i have 2 WAN connections and a SIP-telephony connection.
I am able to direct the SIP connection to a specific interface and the resulting RTP streams are working great.
If the ISP1 fails, all connections work with the other ISP2 ... great
... BUT
if the ISP1 comes back online, the existing SIP connection stay at ISP2 and the new RTP connections try to use ISP1. result: the phones are ringing but there is nothing to hear.
I have to manually restart the SIP connection or disrupt ISP2 to get this working again.
Someone got this running? Some ideas?
Thanks,



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