SIP ALG or firewall on the router
- SIP ALG (Also called SIP PASS THROUGH or SIP HELPER) was invented to get around NAT problems by rewriting some packets.
- Unfortunately, SIP is rather complicated, and most SIP ALG implementations are horribly broken. (Netgear, Dlink, Zyxel).
- If you experience missing audio, failing registrations, failed calls, failed video calls, or failed transfers, please verify that your router does NOT use SIP ALG and disable SIP ALG if it does.
- If you are unable to change the router configuration, try using TLS encryption (if the SIP server supports it) to encrypt the traffic and stop the router from tampering with the packets.
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