It may be that SIP ALG needs to be turned off on your end and the ISP end. I've been able to get double NAT like your setup working with SIP, but if both devices are trying to do SIP ALG you may get strange results.
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It may be that SIP ALG needs to be turned off on your end and the ISP end. I've been able to get double NAT like your setup working with SIP, but if both devices are trying to do SIP ALG you may get strange results.