Definition

call signaling

Call signaling is a process that is used to set up a connection in a telephone network. Call signaling processes include: authentication, to verify the identities of the calling and called parties; authorization, to ensure that the network is not misused and to minimize the risk of denial-of-service (DOS ) attacks; and communications security, to help prevent eavesdropping or manipulation of message content.

In a VoIP network, call signaling is one of three major categories of communications traffic, the other two being call control and media communications. Call signaling is used in voice over IP (VoIP ) systems to establish connections between H.323 endpoints, or between an endpoint and a gatekeeper. H.323 is an International Telecommunication Union (ITU) standard that defines how digital communications occur between terminals, network equipment and services.

Call signaling using Q.931 (a connection protocol for digital networks, especially VoIP systems, in which messages are transmitted as octets) is done according to the ITU H.225.0 specification, which defines message formats for digital multimedia and VoIP communications.

This was last updated in March 2008
Posted by: Margaret Rouse

Email Alerts

Register now to receive SearchUnifiedCommunications.com-related news, tips and more, delivered to your inbox.
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

More News and Tutorials

Do you have something to add to this definition? Let us know.

Send your comments to techterms@whatis.com

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: