![]() I have SIP inspection enabled and don't see any issues with it and I gain the benefit of not only being able to do a show SIP but the necessary pinholes are dynamically created instead of opening wide static holes these providers often request, but the providers still insist having ALG creates more problems. Port forwarding, one-to-one NAT, VPN NAT Traversal, Session Initiation Protocol (SIP), ALG, FTP ALG. How is SIP not broken after leaving the firewall over the public Internet when being NAT'd from a private to public address if the SIP payload contains a private address that inspection would normally fixup - using the older inspection terminology there -) ? Is STUN or TURN the only way preventing this breakage and can I assume that these providers support that or does that have to be confirmed? Is it not better to have inspection? I know that certain SIP implementations don't add addressing in the application layer, but in the these cases they do. Cisco ASA CLI (Example uses 5505 and asa824-k8.bin) Step Step 1 Step 2 Disable SIP ALG/inspection within the policy-map that is being used. I only have the below: auditcert Change to Auditcert Configuration Mode configure Change to Configuration mode exit. Cisco ASA product series or the Cisco IOS Firewall, have SIP ALGs that offer some protection services at protocol layers higher than Layer 3. ![]() ![]() PPTP, IPSec (VPN), RTSP, and SIP should all be selected. However, I don't have the options to issue the below command configure inspection sip disable. On Cisco devices, SIP-ALG is known as SIP Fixup and this option is enabled by default. Go to VoIP Security page Disable SIP Support Go to NAT section Disable Automatic packet filter rule. After talking to a few hosted VoIP providers, they all state that "ALG" or SIP inspection in the case of the Cisco firewall should be disabled. Cisco PIX/ASA firewalls Juniper NetScreens Microsoft Internet Security. Go to policy-map globalpolicy > class inspectiondefault.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |