Techniques for managing transmission rates for users from each of a plurality of call engines (CEs) distributed on a communications network are provided. A list of users with at least one pending call in a corresponding queue from all other CEs is received, wherein each user's queue has a maximum queue depth calculated, in part, using a capped transmission rate in calls per second (CPS) for each user associated with their queue. It is determined, for each user, a total number of CEs having at least one pending call in their corresponding queue. A current CE transmission rate is calculated for each user by dividing the capped transmission rate for each user by the total number of CEs having at least one pending call in their corresponding queue. The current CE transmission rate indicates a rate at which calls in each user's queue are dequeued at each of the plurality of CEs. When a call request is received at a CE from a specific user, a total number of calls currently queued for the specific user in all CEs is determined. A maximum queue depth for the specific user is also determined, the maximum queue depth indicative of the total number of calls the specific user may queue for a predetermined length of time. The call request will be rejected when the total number of calls currently queued exceeds the maximum queue depth.

Measures for use in operating a network node in a telecommunications network. At a network node located in a second part of the network, signaling messages transmitted between a server and end devices in an at least a first group are monitored. Each monitored signaling message includes a telephone dialing number for a given end device in the at least first group and an extension number for the given end device. On the basis of the monitoring, mapping data is stored which includes mappings between telephone dialing numbers and extension numbers for end devices in the at least first group. In response to detecting a loss of connectivity between a first part of the telecommunications network and the second part of the telecommunications network, extension number dialing request messages received from end devices in the first group are processed according to a detected loss of connectivity operating mode.

The present disclosure generally relates to wireless communication systems, more particularly to systems and methods for providing Fixed Mobile Convergence (FMC) service. System receives contact number/short code of first user dialed by second user, and establishes connection between BTAS and IMS server, when second user dials mobile number. Further, system invokes FMC create/update service to trigger modification of IFC service chaining data in IMS core network. Furthermore, system converts short code and transmits invite request messages to IMS core network and triggers ringing mode on mobile/fixed line device. In response to conversion, system transmit invite request messages to IMS core network of mobile number link to fixed line, and in response to transmission, system triggers ringing mode on mobile device and fixed line device, to establish call. Additionally, system establishes call between mobile device and fixed line device of second user, and fixed line/mobile device of first user, respectively.

Measures for use in operating a network node in a telecommunications network. At a network node located in a second part of the network, signaling messages transmitted between a server and end devices in an at least a first group are monitored. Each monitored signaling message includes a telephone dialing number for a given end device in the at least first group and an extension number for the given end device. On the basis of the monitoring, mapping data is stored which includes mappings between telephone dialing numbers and extension numbers for end devices in the at least first group. In response to detecting a loss of connectivity between a first part of the telecommunications network and the second part of the telecommunications network, extension number dialing request messages received from end devices in the first group are processed according to a detected loss of connectivity operating mode.

An Intelligent Independent Call Server (IICS) is coupled to communication equipment of a network that signals the IICS of an established telephone call during which the IICS provides additional features to communication equipment of parties to the established telephone who are subscribers to the services being provided by the IICS. The services being provided by the IICS comprise various telephone call features that can be requested by parties to the established telephone call who have subscribed to such features. Subscriber parties to the telephone call request for specific features during the telephone call by dialing, on their communication devices, certain IICS defined sequences of DTMF keys which when recognized by the IICS causes it to execute the corresponding feature.