由於當時並沒有將 NAT 納入設計, 因此在 NAT 環境下 SIP 難以正常運作, 然而現今網路環境中, 不論是電信業/企業還是家庭都十分依賴 NAT 技術, 為了使 SIP 在 NAT 環境下能夠正常運行, ALG (Application Layer Gateway) 就此誕生, ALG 是一個通過分析與修改 SIP 請求的應用服務, 使 SIP 能夠順利...
In a signalling only environment where the RTP stream bypasses the FortiGate unit, you can disable RTP pinholing to improve performance. SIP TCP and UDP support SIP Message order checking Configurable Header line length maximums The SIP ALG works at the application level after ingress packets ...
I am using third party phones with g711ullaw codec. If i connect soft phone with same configuration it works fine. i disable sip session helper and default-voip-alg-mode is kernel-helper-based. i am not much familiar with cisco so unable to understand logThanks BB 0...
The problem solution: disable all feature relate to sip-alg, sip help address (set sip-helper disable, set strict-register disable )and here. Reference: https://layer8specialist.home.blog/2018/11/23/disable-sip-alg-on-fortigate-vdom/ 1 Helpful Reply ...