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Linksys Router SIP ALG Problem.

Hello, I have Powerful Linksys EA900 Smart WiFi Router, I m using Elastix 2.5.
From outside External Extension sometime have audio issues oneway audio,
All forums and blogs I see everyone says Disable SIP ALG, when I uncheck (Disable) SIP ALG on my router noway any audio,
I Have forwarded ports to my PBX (SIP UDP 5060-5070) and (RTP UDP 10000-20000)
what can I doo? If SIP ALG Enabled works two-way audio but sometime issues oneway audio,
Also SPI Firewall have disabled.

Thanks