Monitoring Voice ALG SIP


Use the monitoring functionality to view the voice ALG SIP page.


To monitor voice ALG SIP select Monitor>Security>Voice ALGs>SIP.


Table 213 summarizes key output fields in the voice ALG SIP page.

Table 213: Voice ALG SIP Monitoring Page



Additional Information

Virtual Chassis Member

Displays the list of virtual chassis members.

Select one of the virtual chassis members listed.

Refresh Interval (30 sec)

Displays the time interval set for page refresh.

Select the time interval from the drop-down list.


Displays the option to refresh the page.


Provides an option to clear the monitor summary.

Click Clear to clear the monitor summary.

SIP Counters Information


Displays the SIP counter information. The available options are:

  • BYE— Number of BYE requests sent. A user sends a BYE request to abandon a session. A BYE request from either user automatically terminates the session.
  • REGISTER— Number of REGISTER requests sent. A user sends a REGISTER request to a SIP registrar server to inform it of the current location of the user. The SIP registrar server records all the information it receives in REGISTER requests and makes this information available to any SIP server attempting to locate a user.
  • OPTIONS— Number of OPTIONS requests sent. An OPTION message is used by the User Agent (UA) to obtain information about the capabilities of the SIP proxy. A server responds with information about what methods, session description protocols, and message encoding it supports.
  • INFO— Number of INFO requests sent. An INFO message is used to communicate mid-session signaling information along the signaling path for the call.
  • MESSAGE— Number of MESSAGE requests sent. SIP messages consist of requests from a client to the server and responses to the requests from the server to a client for the purpose of establishing a session (or a call).
  • NOTIFY— Number of NOTIFY requests sent. A NOTIFY message is sent to inform subscribers about the change in state of the subscription.
  • PRACK— Number of PRACK requests sent. The PRACK request plays the same role as the ACK request, but for provisional responses.
  • PUBLISH— Number of PUBLISH requests sent. The PUBLISH request is used for publishing the event state. PUBLISH is similar to REGISTER that allows a user to create, modify, and remove state in another entity which manages this state on behalf of the user.
  • REFER— Number of REFER requests sent. A REFER request is used to refer the recipient (identified by the Request-URI) to a third party identified by the contact information provided in the request.
  • SUBSCRIBE— Number of SUBSCRIBE requests sent. A SUBSCRIBE request is used to request current state and state information updates from a remote node.
  • UPDATE— Number of UPDATE requests sent. An UPDATE request is used to create a temporary opening in the firewall (pinhole) for new or updated Session Description Protocol (SDP) information. The following header fields are modified: Via, From, To, Call-ID, Contact, Route, and Record-Route.
  • BENOTIFY— Number of BENOTIFY requests sent. A BENOTIFY request is used to reduce the unnecessary SIP signaling traffic on application servers. Applications that do not need a response for a NOTIFY request can enhance performance by enabling BENOTIFY.
  • SERVICE— Number of SERVICE requests sent. The SERVICE method is used by a SIP client to request a service from a SIP server. It is a standard SIP message and will be forwarded until it reaches the server or end user that is performing the service.
  • OTHER— Number of OTHER requests sent.


Displays the transmit and retransmit method.

1xx, RT

Displays one transmit and retransmit method.

2xx, RT

Displays two transmit and retransmit methods.

3xx, RT

Displays three transmit and retransmit methods.

4xx, RT

Displays four transmit and retransmit methods.

5xx, RT

Displays five transmit and retransmit methods.

6xx, RT

Displays six transmit and retransmit methods.


Call ID

Displays the call ID.


Displays the call method used.


Displays the state of the ALG SIP.

Group ID

Displays the group identifier.

Invite Method Chart

Displays the invite method chart. The available options are:

  • T/RT
  • 1xx/ RT
  • 2xx/ RT
  • 3xx/ RT
  • 4xx/ RT
  • 5xx/ RT
  • 6xx/ RT

SIP Error Counters


Displays the SIP error counters. The available options are:

  • Total Pkt-in— Number of SIP ALG total packets received.
  • Total Pkt dropped on error— Number of packets dropped by the SIP ALG.
  • Call error— SIP Number of ALG call errors.
  • IP resolve error— Number of SIP ALG IP address resolution errors.
  • NAT error— SIP Number of ALG NAT errors.
  • Resource manager error— Number of SIP ALG resource manager errors.
  • RR header exceeded max— Number of times the SIP ALG RR (Record-Route) headers exceeded the maximum limit.
  • Contact header exceeded max— Number of times the SIP ALG contact header exceeded the maximum limit.
  • Call dropped due to limit— Number of SIP ALG calls dropped because of call limits.
  • SIP stack error— Number of SIP ALG stack errors.
  • SIP Decode error— Number of SIP ALG decode errors.
  • SIP unknown method error— Number of SIP ALG unknow method errors.
  • SIP DSCP marked—SIP ALG DSCP marked.
  • SIP DSCP marked error— Number of SIP ALG DSCPs marked.
  • RTO message sent— Number of SIP ALG marked RTO messages sent.
  • RTO message received— Number of SIP ALG RTO messages received.
  • RTO buffer allocation failure— Number of SIP ALG RTO buffer allocation failures.
  • RTO buffer transmit failure— Number of SIP ALG RTO buffer transmit failures.
  • RTO send processing error— Number of SIP ALG RTO send processing errors.
  • RTO receiving processing error— Number of SIP ALG RTO receiving processing errors.
  • RTO receive invalid length— Number of SIP ALG RTOs receiving invalid length.
  • RTO receive call process error— Number of SIP ALG RTO receiving call process errors.
  • RTO receive call allocation error— Number of SIP ALG RTO receiving call allocation error.
  • RTO receive call register error— Number of SIP ALG RTO receiving call register errors.
  • RTO receive invalid status error— Number of SIP ALG RTO receiving register errors.


Provides count of response codes for each SIP ALG counter category.

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