Should I Enable MGCP ALG and SIP ALG ‎ 06:13 PM. Message 1 of 2 (5,801 Views) Should i does it affect my network performance. Have same question. Re: sip alg ‎21 Jun 2020 10:59 AM I am using a Polycom VVX300 and have tried changing ethernet to fast, tried usiing VPN and tried disabling IPV6 but none of these have worked, please tell me there i sanother work around that might work? If I cannot get my phone working at home I will be forced to go into the office. Arris TG862G and TG862G-CT - SIP ALG is enabled and no way to disable.These are often used by Comcast as a Gateway. AT&T Uverse Arris NVG589 - SIP ALG is enabled by default and cannot be disabled. By default it will not support hosted phones, AT&T may be able to open port 5060 for SIP traffic but it is reported to us it is not possible for user level admin to do so. Application Layer Gateways (ALGs) manage specific protocols by intercepting traffic as it passes through the security device. After analyzing the traffic, the ALG allocates resources to permit the traffic to pass securely.

Application Layer Gateways (ALGs) manage specificprotocols by intercepting traffic as it passes through the securitydevice. After analyzing the traffic, the ALG allocates resources topermit the traffic to pass securely. By default, all ALGs are enabledon a security device. In situations where a security device is receivingan excessive amount of malicious or accidental traffic of a particulartype, you might want to disable the associated ALG.

You can enable or disable the following ALG protocols:

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• H.323 —Three ALGs handle specific tasks for H.323traffic. To disable H.323 on the security device, you must disablethe following ALGs:

  • H.245 —This ALG is a control signaling protocolused to exchange messages between H.323 endpoints.

  • Q.931 —This ALG is a Layer 3 protocol used for IntegratedServices Digital Network (ISDN) call establishment, maintenance, andtermination between H.323 endpoints.

  • RAS —The Registration, Admission, and Status (RAS)ALG is used to register, control admission, change bandwidth, checkstatus, and perform disengage procedures between H.323 endpoints andgatekeepers.

• MSRPC —The Microsoft Remote Procedure Call (MS-RPC)ALG enables a program running on one host to call procedures in aprogram running on another host. Because of the large number of RPCservices and the need to broadcast, the transport address of an RPCservice is dynamically negotiated based on the service program’suniversal unique identifier (UUID).

• RTSP —The Real-Time Streaming Protocol (RTSP) controlsdelivery of one or more synchronized streams of multimedia, such asaudio and video.

• SIP —The Session Initiation Protocol (SIP) is anInternet Engineering Task Force (IETF)-standard protocol for initiating,modifying, and terminating multimedia sessions (such as conferencing,telephony, or multimedia) over the Internet. SIP is used to distributethe session description, to negotiate and modify the parameters ofan existing session, and to terminate a multimedia session.

• SQL — The SQL ALG handles SQL, a relational databasemanagement system.

• SUNRPC — The Sun Remote Procedure Call (SUNRPC)enables a program running on one host to call procedures in a programrunning on another host. Because of the large number of RPC servicesand the need to broadcast, the transport address of an RPC serviceis dynamically negotiated based on the service’s program numberand version number.

• MGCP — The Media Gateway Control Protocol (MGCP)is supported on security devices in Route, Transparent, and NetworkAddress Translation (NAT) modes. MGCP is a text-based ApplicationLayer protocol used for call setup and control. MGCP is based on amaster-slave call control architecture. The media gateway controller(call agent) maintains call control intelligence, while the mediagateways carry out instructions from the call agent.

• PPTP — The Point-to-Point Tunneling Protocol (PPTP)provides IP security at the Network Layer. PPTP consists of a controlconnection and a data tunnel. The control connection runs over TCPand helps in establishing and disconnecting calls, and the data tunnelhandles encapsulated Point-to-Point Protocol (PPP) packets carriedover IP.

• SCTP — The Stream Control Transmission Protocol(SCTP) is an IP transport protocol that exists at the same level asUDP and TCP. SCTP currently provides Transport Layer functions toInternet applications. It provides a reliable transport service thatsupports data transfer across the network, in sequence and withouterrors. You can configure the security device to perform statefulinspection on all SCTP traffic without performing deep inspection.If you enable stateful inspection of SCTP traffic, the SCTP ALG dropsany anomalous SCTP packets.

• Apple-iChat Settings — The Apple iChat ALG providessupport for iChat applications by opening pinholes that allow thetext, audio, and video calls to pass through devices running ScreenOS6.1 or later. When you enable the AppleiChat ALG functionality, thedevice opens pinholes for the configured call-answer-time to establishthe iChat audio/video session. The call-answer-time is the durationof time for which the device opens the pinholes for establishing theiChat audio/video session. The default value for call-answer-timeis 32 seconds. When this timer expires, the device closes the pinholes.The range for configuring the call-answer-time is 20 to 90 seconds.The iChat application fragments the packets it sends to the receiverbased on the maximum segment size (MSS) of the receiver. The MSS valuedepends on the network configuration of the receiver. The fragmentedpacket is reassembled at the ALG for address translation. By default,the reassembly option is disabled.

• IPsec-NAT Settings — You can set the IPsec-NAT timeoutto run ESP with a DIP pool. The default value is 30.

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