SDP: Session Description Protocol, RFC 2327. SIP and SDP are defined in the following RFCs: SIP: Session Initiation Protocol, RFC 3261. Using SIP, the ASA can support any SIP VoIP gateways and VoIP proxy servers. However, some VoIP solutions have their own mechanism to bypass NAT and maintain communication while some require NAT Traversal to be configured on the firewall. ASDM Book 2: Cisco ASA Series Firewall ASDM Configuration Guide, 7.12. When there is a NAT in between NAT masquerades the original IPso there is a probability that the communication may fail. And about NAT traversal, if you have a NAT device or a firewall that implements NAT in between or as a gateway NAT traversal must be used to make sure your communication works because in VoIP communication the client also acts as a server, meaning the communication has to be both ways. While there are some vendors that use their proprietary protocol, SIP like protocol is necessary regardless. In order to disable the SIP implementation- in global config mode on the router go to the policy map and remove the inspect sip line. We just replaced a Cisco ASA Site-to-Site VPN connection with two USG (3P. There is no choice here because some VoIP devices require the implicit use of SIP protocol, That is what they use to initiate, manage, and terminate sessions. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Select Rule Actions, Protocol Inspection. Select Configuration, Firewall, Service Policy Rules. Configuring via ASDM (ASA Only) Connect into the device using ASDM. The BT SIP Trunk / BTnet service has the following requirements: If address translation is required then SIP will only work with NAT and not PAT The PBX will need to appear on the outside of the firewall with a RIPE IP address Your PBX requires access to the BT SIP platform on IP address 85.xxx.xx.x using port numbers 5060 to 5061. You are probably looking to implement VoIP in your network if I'm not mistaken. The documentation set for this product strives to use bias-free language. Save the Running Configuration by typing the following command. SIP is a protocol used for session management in VoIP or video communication, On the other hand NAT Traversal is a technique used to maintain connectivity over networks where NAT is used.
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