User`s manual

6.3.4 ALG

SIP ALG is Application layer gateway. If the user has an IP phone(SIP) or VoIP

gateway(SIP) behind the ADSL router, the SIP ALG can help VoIP packet passthrough

the router (NAT enabled).

Note: SIP (Session Initiation Protocol, RFC3261) is the protocol of choice for most VoIP

(Voice over IP) phones to initiate communication. This ALG is only valid for SIP

protocol running UDP port 5060.