Asynchronous and/or synchronous telephony protocol systems and methods may include an asynchronous signaling node (ASN) and/or a call duration time quota from a charging onset to place and complete a call based on a first device call request as received from a first user mobile device on a packet switched network. The asynchronous systems include instructions to automatically modify the telephony address with a prefix and destination address when the first device has insufficient or independent balance or upon a network exception; route the modified call signal to the ASN; and deliver and automatically disconnect the call when the call is completed. The synchronous systems are balance-independent and include instructions to automatically set the call duration time quota upon such exception, and deliver and automatically disconnect the call from the second user telephony device when the call is completed or when the call duration time quota is exceeded.

The present disclosure describes methods and systems for establishing a Session Initiation Protocol Session. One method includes transmitting a first message requesting authentication configuration information; in response to the first message, receiving a second message that includes the authentication configuration information; transmitting a third message that includes authentication information based upon the received authentication configuration information; receiving an authentication challenge request that is formatted according to the second protocol; and in response to receiving the authentication challenge request, transmitting an authentication response to the second network node.

Systems, methods, and devices can be utilized for policy control function (PCF) fallback during the set up of a session utilizing a 5th Generation (5G) core network. An example method includes receiving, from a session management function (SMF), a request for a policy corresponding to a session. The request includes a first policy identifier corresponding to a first policy control function (PCF). The example method further includes determining that the first PCF is unavailable, generating a modified request by replacing the first policy identifier with a second policy identifier in the request. The second policy identifier corresponds to a second PCF. The example method also includes transmitting, to the second PCF, the modified second request.

A computer-implemented network verification system includes a second device situated in a terminating call network and configured to receive a call signal from a first device situated in an originating network. The first device is coupled to a first registry that stores originating call records. The first registry is configured to obtain, from the first device, and store call data and a SIP identity header associated with the call signal. The system also includes a second registry coupled to the second device and configured to receive, from the first registry over an out-of-band verification network, a first verification request that contains the originating call record, including the SIP identity header associated with the call signal. The second registry is further configured to send the SIP identity header contained in the first verification request to the second device.

A process and apparatus to facilitate communication between callers and callees in a system comprising a plurality of nodes with which callers and callees are associated is disclosed. In response to initiation of a call by a calling subscriber, a caller identifier and a callee identifier are received. Call classification criteria associated with the caller identifier are used to classify the call as a public network call or a private network call. A routing message identifying an address, on the private network, associated with the callee is produced when the call is classified as a private network call and a routing message identifying a gateway to the public network is produced when the call is classified as a public network call.

System and method for detecting SMS parameters manipulation. A first SMS registry is coupled to a first Short Message Service Center (SMSC) and optionally to other SMS registries. The first SMSC is within a terminating telephone network. The first SMS registry receives first and second information about an SMS message that was sent from another telephone network or from an External Short Messaging Entity (ESME) and is destined to the first SMSC. The first and second information represent status of the SMS message respectively before and after the SMS message enters the terminating telephone network. The first SMS registry or a firewall automatically compares at least corresponding portions of the first and second information. As a result of the comparison, in response to detecting a difference between the at least portions of the first and second information, the first SMS registry automatically sends a signal indicating SMS parameter manipulation.

A computer-implemented network verification system includes a second device situated in a terminating call network and configured to receive a call signal from a first device situated in an originating network. The first device is coupled to a first registry that stores originating call records. The first registry is configured to obtain, from the first device, and store call data and a SIP identity header associated with the call signal. The system also includes a second registry coupled to the second device and configured to receive, from the first registry over an out-of-band verification network, a first verification request that contains the originating call record, including the SIP identity header associated with the call signal. The second registry is further configured to send the SIP identity header contained in the first verification request to the second device.

An apparatus enables communication between a user device and a communication server. The apparatus receives a device identifier of the user device and determines after searching a device-to-token database that the device identifier is not associated with any device communication token. The apparatus activates a predetermined application on the user device, and thereafter receives a device communication token of the predetermined application. A mapping of the device communication token with the device identifier is stored in the device-to-token database after which a communication account is created for the user device on a communication server. A login credential for the communication account is sent to the user device in a message addressed to the predetermined application and transmitted via a message server. The predetermined application on the user device receives the message, and thereafter automatically logs in to the communication server according to the login credential in the message.

A method of establishing a communication link between a mobile terminal of a wireless network and a subscriber of a network, such as an enterprise network, and/or a residential network.

Unsolicited electronic communications such as robocalls and person-initiated solicitation calls are reduced by imposing tolls for completion of the connections to the called parties, and refunding the tolls to the entities indicated by the electronic communications as the calling parties. In this way, a dishonest originator of a spoofed call bears the cost of the toll, and the toll is not refunded to the dishonest originator. On the other hand, the toll collected from an honest originator of a non-spoofed call is refunded to the honest originator, making the toll transparent to the honest originator and avoiding annoyance of the honest caller caused by the toll. Unsolicited calls may be subjected to filtering, particularly filtering based on the indications of the origins of the calls.