A first machine-to-machine services capabilities layer entity for triggering in a communication network comprising: a processor; and a memory coupled to the processor, the memory having stored thereon executable instructions that when executed by the processor cause the processor to effectuate operations comprising: providing a first message for registering with a second machine-to-machine services capabilities layer entity, characterised in that: the first message for registering with the second machine-to-machine services capabilities layer entity comprising instructions for sending a trigger message to the first machine-to-machine services capabilities layer entity, the instructions for sending the trigger message to the first machine-to-machine services capabilities layer entity comprising an access network device identifier and a trigger port number, the access network device identifier comprising a mobile station international subscriber directory number, MSISDN, 3GPP external identifier, or international mobile subscriber identity, IMSI; and in that the operations comprise: listening for the trigger message based on the provided instructions for sending the trigger message to the first machine-to-machine services capabilities layer entity, the trigger message indicative of being sent by the second machine-to-machine services capabilities layer entity and the trigger message sent over a control plane. a processor; and a memory coupled to the processor, the memory having stored thereon executable instructions that when executed by the processor cause the processor to effectuate operations comprising: providing a first message for registering with a second machine-to-machine services capabilities layer entity, characterised in that: the first message for registering with the second machine-to-machine services capabilities layer entity comprising instructions for sending a trigger message to the first machine-to-machine services capabilities layer entity, the instructions for sending the trigger message to the first machine-to-machine services capabilities layer entity comprising an access network device identifier and a trigger port number, the access network device identifier comprising a mobile station international subscriber directory number, MSISDN, 3GPP external identifier, or international mobile subscriber identity, IMSI; and in that the operations comprise: listening for the trigger message based on the provided instructions for sending the trigger message to the first machine-to-machine services capabilities layer entity, the trigger message indicative of being sent by the second machine-to-machine services capabilities layer entity and the trigger message sent over a control plane. providing a first message for registering with a second machine-to-machine services capabilities layer entity, characterised in that: the first message for registering with the second machine-to-machine services capabilities layer entity comprising instructions for sending a trigger message to the first machine-to-machine services capabilities layer entity, the instructions for sending the trigger message to the first machine-to-machine services capabilities layer entity comprising an access network device identifier and a trigger port number, the access network device identifier comprising a mobile station international subscriber directory number, MSISDN, 3GPP external identifier, or international mobile subscriber identity, IMSI; and in that the operations comprise: the first message for registering with the second machine-to-machine services capabilities layer entity comprising instructions for sending a trigger message to the first machine-to-machine services capabilities layer entity, the instructions for sending the trigger message to the first machine-to-machine services capabilities layer entity comprising an access network device identifier and a trigger port number, the access network device identifier comprising a mobile station international subscriber directory number, MSISDN, 3GPP external identifier, or international mobile subscriber identity, IMSI; and in that the operations comprise: listening for the trigger message based on the provided instructions for sending the trigger message to the first machine-to-machine services capabilities layer entity, the trigger message indicative of being sent by the second machine-to-machine services capabilities layer entity and the trigger message sent over a control plane.