Elastix SIP Firewall, User Manual

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Max_requestName_len
Max_requestName_len specifies the maximum request name size that is part of the CSeq
ID. The Default is set to 20. The allowed range for this option is 1 - 65535
Max_from_len
The From header field indicates the identity of the initiator of the SIP request.
Max_from_len specifies the maximum from field size. The allowed range for this option is
1 - 65535.
Max_to_len
The to header field specifies the desired recipient of the SIP request. Max_to_len
specifies the maximum to field size. The Default is set to 256. The allowed range for this
option is 1 - 65535.
Max_via_len
The Via header field indicates the transport used for the SIP transaction & identifies the
location where the SIP response is to be sent.
Max_via_len specifies the maximum Via field size. The Default is set to 1024. The
allowed range for this option is 1 - 65535.
Max_contact_len
The Identifier used to contact that specific instance of the SIP client/server for subsequent
requests. Max_contact_len specifies the maximum Contact field size. The Default is set to
256. The allowed range for this option is 1 - 65535.
Max_content_len
Max_content_len specifies the maximum content length of the message body. The
Default is set to 1024. The allowed range for this option is 1 - 65535.
4.3. Firewall Rules
The firewall rules configuration will allow the administrator in configuring what traffic
should be allowed to protect SIP PBX/Gateway network from an untrusted wan zone,
besides DPI enabled SIP traffic and RTP traffic. The administrator needs to specify the
source and destination networks and port numbers and protocol that will be used as the
matching criteria in the filtering rules and action to be taken on matching the filtering rule.
The possible actions are to block the traffic and allow the traffic on matching the filtering
rule. The rules precedence will be in the order in which the rules configured on firewall
rules table.