CN1221117C - Method of transmissive transmission of signaling - Google Patents

Abstract

The present invention discloses a method for the transparent transmission of signaling, which is suitable for the transmission of ISUP signaling according to a standard H. 323 protocol. The present invention comprises the flowing steps: a) after a sending end receives ISUP signaling transmitted from a launching device, all of the ISUP signaling is filled in sequence into the data field of a non-standard data field in H. 323 protocol information; the ID information of a manufacturer is filled into the device information field of the non-standard data field in step a, and then the filled information is packed and is sent to a receiving end through the H. 323 protocol; b) With the H. 323 information being received, the receiving end unpacks the H. 323 information and extracts the ID information of the manufacturer from the unpacked H. 323 information. Whether the ID information of the manufacturer is consistent with own information is judged. If yes, the ISUP signaling to be transmitted is extracted from the data field of the non-standard data field in the H. 323 protocol information and is sent to a target device. If false, the transparent transmission flow of the current ISUP signaling exits. The present invention can realize the load bearing and the transmission of the ISUP signaling according to the H. 323 protocol.

Description

A signaling transparent transmission method

technical field

The present invention relates to the transparent transmission technology of the H.323 protocol, in particular to a method for transparent transmission of Integrated Services Digital Network User Part (ISUP, ISDN User Part) signaling through H.323 protocol messages.

Background technique

Currently, ISUP signaling is carried on the packet network mainly through the SIGTRAN protocol, but the SIGTRAN protocol implements complete signaling forward transmission in the form of relay, and generally requires a separate signaling gateway (SG, Signal Gateway) device to transmit signaling.

For some existing original networking methods, there is no separate SG device, so the SIGTRAN protocol is not applicable to the H.323 IP voice gateway (VoIP GW) in this network. In this original networking mode, when the H.323 VoIP GW is running on the Internet, there is no specific one-to-one correspondence between the H.323 protocol and ISUP signaling in terms of the type of signaling message and the specific content of the message.

Some ISUP signaling has no one-to-one correspondence with the H.225.0/Q.931+ messages in the H.323 protocol suite, and some ISUP signaling messages are the same as the Q.931 messages quoted by the H.225.0 protocol in the H.323 protocol suite. Even if there is a certain corresponding relationship, it is impossible to carry all the contents of the source ISUP message. For example: the initial address information (IAM, Initial Address Message) in the ISUP signaling corresponds to the SETUP message in the H.323/Q.931 signaling, and the full address information (ACM, Address CompleteMessage) in the ISUP signaling is the same as the H. The ALERTING message in the 323/Q.931 signaling corresponds to the ALERTING message in the ISUP signaling, and the subsequent address information (SAM, Sequence Address Message) in the ISUP signaling corresponds to the INFORMATION message in the H.323/Q.931 signaling, and the response information in the ISUP signaling (ANM, Answer Message) corresponds to the CONNECT message in H.323/Q.931 signaling. For the basic ISUP signaling messages in these calls, peer-to-peer messages can be found in the H.323 protocol to deliver some basic message content, but because the information elements carried in the ISUP signaling messages are different from those contained in the H.323 protocol suite There is no one-to-one correspondence between the contents of the cells specified in the call control protocol H.225.0/Q.931, so the message transmitted to the peer end through the packet network according to the original standard H.323 protocol cannot carry all the source ISUP Message content.

Since the H.323 VoIP GW does not have standard H.323 protocol messages or message fields that can carry and transmit ISUP signaling, in the networking mode without a separate signaling network, that is, the voice path and signaling go through the same In the channel networking mode, ISUP signaling cannot be carried on the packet network through the H.323 VoIP GW.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a signaling transparent transmission method, so that the H.323 protocol can bear and transmit the ISUP signaling.

Realize the present invention, need following steps:

a. After receiving the ISUP signaling transmitted by the initiating device, the sending end fills the ISUP signaling in the data field of the non-standard data field of the H.323 protocol message;

b. Fill the manufacturer identification information in the device information domain of the non-standard data field described in step a, then encapsulate the filled message and send it to the receiving end through the H.323 protocol;

c. After receiving the H.323 message, the receiving end decapsulates it first, extracts the vendor identification information from the H.323 protocol message after decapsulation, and judges whether the vendor identification information is consistent with its own information, and if so, enters the step d, otherwise, end the current process;

d. Extract the ISUP signaling to be transmitted from the data field of the non-standard data field of the H.323 protocol message, and send the ISUP signaling to the destination device.

As can be seen from the above method, the present invention carries out the user-defined method for bearer transmission of ISUP signaling through the reserved field of the H.323 protocol message, and realizes the transparent transmission of ISUP signaling, so that in a group without an independent signaling network In the network mode, ISUP signaling can also be carried on the packet network through the H.323 GW, so the investment in existing network equipment can be protected, and there is no need to update the networking form and purchase equipment. Through the transparent transmission of ISUP signaling, the ISUP signaling between the original narrowband switches can also be carried on the packet network through the H.323 GW. The transparent transmission of signaling also makes it possible to track and maintain signaling in the original network networking mode without a separate signaling network.

Description of drawings

Fig. 1 is the flowchart of the realization of the method of the present invention.

FIG. 2 is a schematic diagram of ISUP signaling transparent transmission according to an embodiment of the present invention.

Detailed ways

In this embodiment, the H.323 VoIP GW uses the standard H.323 protocol message type and the non-standard data segment nonStandardData in the message field to customize to encapsulate and carry the ISUP signaling message. The message definition specified in the H.323 protocol family call control protocol H.225.0/Q.931 protocol ASN.1 includes the non-standard data (nonStandardData) unified field:

           
H323-UU-PDU::＝SEQUENCE

{

H323-message-body CHOICE

{

setup Setup-UUIE,

callProceeding CallProceeding-UUIE,

connect Connect-UUIE,

alerting Alerting-UUIE,

userInformation UI-UUIE,

releaseComplete ReleaseComplete-UUIE,

facility Facility-UUIE,

...,

progress Progress-UUIE,

Empty NULL

},

nonStandardData NonStandardParameter OPTIONAL,

...,

h4501SupplementaryService SEQUENCE OF OCTET STRING OPTIONAL

h245Tunneling BOOLEAN,
     h245Control SEQUENCE OF OCTET STRING OPTIONAL,

     nonStandardControl SEQUENCE OF NonStandardParameter OPTIONAL
}

        

Among them, the non-standard parameter (NonStandardParameter) is defined as follows:

           
NonStandardParameter::=SEQUENCE

 {

   nonStandardIdentifier NonStandardIdentifier,

  data OCTET STRING

}

NonStandardIdentifier::＝CHOICE

{

object OBJECT IDENTIFIER,
    h221NonStandard H221NonStandard,

    ...,

    }

    H221NonStandard::=SEQUENCE

    { t35CountryCode INTEGER(0..255),

      t35Extension INTEGER(0..255),

      manufacturerCode INTEGER(0..65535),

      ...,

    }

        

Among them, OCTET STRING is composed of byte string length lenth and byte string content.

Through the H.323 VoIP GW, use the standard H.323 protocol message type and the non-standard data segment nonStandardData in the message field to customize to encapsulate and carry the ISUP signaling message, and the H.323 protocol message or message field used for carrying does not need Pay attention to the specific meaning of ISUP signaling, and realize the transparent transmission of ISUP signaling.

The present invention will be further described in detail below through specific embodiments and with reference to accompanying drawing 1 .

Steps 101 to 102: H322 VoIP GW receives the ISUP signaling sent by the circuit network and judges whether there is a corresponding H.323 protocol message corresponding to it, if yes, execute step 103, otherwise execute step 104.

Step 103: Adopt the message transparent transmission mode in which the ISUP signaling corresponds to the H.323 protocol suite. When the H.323 GW receives the incoming ISUP signaling message, it usually converts it into the Q931+ message specified in the peer-to-peer H.323 protocol suite. .323 GW will convert it into the SETUP message of the H.323 protocol message. Since the SETUP message specified in the H.323 protocol cannot completely cover all the cell contents of the IAM message in the ISUP signaling, this method uses the above SETUP message , ALERTING and other common nonStandardData fields in Q931+ messages, fill in the received ISUP signaling message intact into the octet field of the data field data in nonStandardData, fill in the length field of data with the actual length of the ISUP message, and then enter Step 105.

Step 104: Adopt the message transparent transmission mode in which ISUP has no corresponding relationship with the H.323 protocol suite. When there is no one-to-one correspondence between the ISUP signaling message and the H.225.0/Q.931+ message in the H.323 protocol suite, a specific H.323 message Userinformation is designated as the bearer message to implement the ISUP signaling of the signaling. Transparent forwarding of commands. This method uses the UserInformation message in H.225.0/Q.931+ to carry ISUP signaling messages such as Supplementary Service Request Information (FAR) and Supplementary Service Acceptance Information (FAA), where the specific ISUP message is encapsulated in the specified UserInformation In the nonStandardData/data/octet field of the message, fill in the length of the received ISUP message in nonStandardData/data/length.

Step 105: Use the nonStandardIdentifier field of the device information field in the NonStandardParameter to identify the device information. Since the fields used in this method are not stipulated in the H.323 standard protocol, it is only applicable to the ISUP signaling intercommunication between the same type of devices that abide by the same agreement. Therefore, the h221NonStandard field in nonStandardIdentifier is selected, and the country of the device is given. Code, extension code and manufacturer code to uniquely identify the manufacturer of the device.

Steps 106 to 108: The source end sends the encapsulated message to the packet network with the H.323 protocol, and the receiving end receives the message and analyzes the h221NonStandard field in the nonStandardIdentifier to determine whether the source end H.323VoIP GW complies with the same manufacturer’s equipment It is agreed that if yes, execute step 109; otherwise, end the current transparent transmission process and use other methods for transparent transmission.

Steps 109 to 112: By judging whether there is a corresponding relationship between the H.323 protocol family and the ISUP, the ISUP signaling is extracted from the nonStandardData field of the corresponding or defined H.323 protocol message and sent to the network.

Through the above process, the bearer transmission process of ISUP signaling through H.323 VoIP GW on the packet network is completed.

Fig. 2 is a schematic diagram of transparently transmitting ISUP signaling through H.323 VoIP GW using H.323 protocol messages. As shown in Fig. It is practicable for the local GW to transparently transmit to the opposite GW on the packet network and restore the original ISUP signaling.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (3)

1, a kind of transmitting method of signaling, be applicable to standard H.323 agreement the transmission of ISUP signaling be is characterized in that may further comprise the steps:

After a, transmitting terminal are received the ISUP signaling that initiating equipment transmission comes, this ISUP signaling is filled in the data field of the non-standard data field of protocol message H.323;

B, identification of the manufacturer information is filled in the facility information territory of the described non-standard data field of step a, then populated message is encapsulated and send to receiving terminal by agreement H.323;

H.323 c, receiving terminal receive first decapsulation after the message, extract identification of the manufacturer information the H.323 protocol message after decapsulation, judge whether this identification of the manufacturer information is consistent with the information of self, if, then enter steps d, otherwise, current flow process finished;

D, from the data field of the non-standard data field of protocol message H.323, extract the ISUP signaling that to transmit, and this ISUP signaling is sent to destination device.

2, method according to claim 1 is characterized in that step a further comprises:

Whether after transmitting terminal is received the ISUP signaling, judging earlier H.323 has the message of standard corresponding with this ISUP signaling in the agreement, if having, then this ISUP signaling is filled in the non-standard data field of corresponding H.323 protocol message; Otherwise, this ISUP signaling is filled in the non-standard data field of H.323 protocol message of appointment.

3, method according to claim 1 is characterized in that steps d further comprises:

Receiving terminal judges whether to have the ISUP signaling that corresponding relation is arranged with the current H.323 protocol message of receiving, if having, then extracts the ISUP signaling message from the non-standard data field of the H.323 protocol message of correspondence; Otherwise, from the non-standard data field of the H.323 protocol message of appointment, extract the ISUP signaling that will transmit.

Images