A method, in a machine-to-machine, M2M, proxy node, of communication, wherein the M2M proxy node may serve as a Session Initiation Protocol, SIP, server and is located at a border between a first network domain being a Packet Data Network, PDN, and a second network domain being a Public Land Mobile Network, PLMN, the method comprising: receiving a machine-to-machine access communication request from the first network domain, the access communication request including a device specific identifier associated with the first network domain, wherein the device specific identifier is an International Mobile Subscriber Identity, IMSI; translating the device specific identifier, the translated identifier being associated with the second network domain, the second network domain being distinct from said first network domain, the translated identifier being an IP address if an IP address exists, wherein the translated identifier ensures that an M2M device has an IP address; and transmitting, to the first network domain, a status or device information with the IP address of the M2M device, the status or device information relating to the M2M device in the second network domain and the status or device information being defined by the translated identifier characterized in that the method further comprises: maintaining a mapping table, the mapping table including a plurality of entries, each entry including the device specific identifier associated with the first network domain and a corresponding device specific identifier associated with the second network domain, wherein translating further comprises: indexing for an entry in the mapping table using the device specific identifier associated with the first network domain; retrieving from the entry the corresponding device specific identifier associated with the second network domain, wherein the corresponding device specific identifier is an IP address of a device in the second network domain; and providing the IP address as the translated identifier, wherein the device information is the IP address; and wherein the translating further comprises: if the corresponding device specific identifier is not retrieved, sending a paging notification to a processing node in the second network domain; determining the corresponding device specific identifier; sending the corresponding device specific identifier to the M2M proxy node; and recording the corresponding device specific identifier in a same entry as the received device specific identifier, wherein the corresponding device specific identifier is an IP address of a device in the second network domain and the status is a notification of the paging. receiving a machine-to-machine access communication request from the first network domain, the access communication request including a device specific identifier associated with the first network domain, wherein the device specific identifier is an International Mobile Subscriber Identity, IMSI; translating the device specific identifier, the translated identifier being associated with the second network domain, the second network domain being distinct from said first network domain, the translated identifier being an IP address if an IP address exists, wherein the translated identifier ensures that an M2M device has an IP address; and transmitting, to the first network domain, a status or device information with the IP address of the M2M device, the status or device information relating to the M2M device in the second network domain and the status or device information being defined by the translated identifier maintaining a mapping table, the mapping table including a plurality of entries, each entry including the device specific identifier associated with the first network domain and a corresponding device specific identifier associated with the second network domain, indexing for an entry in the mapping table using the device specific identifier associated with the first network domain; retrieving from the entry the corresponding device specific identifier associated with the second network domain, wherein the corresponding device specific identifier is an IP address of a device in the second network domain; and providing the IP address as the translated identifier, wherein the device information is the IP address; and if the corresponding device specific identifier is not retrieved, sending a paging notification to a processing node in the second network domain; determining the corresponding device specific identifier; sending the corresponding device specific identifier to the M2M proxy node; and recording the corresponding device specific identifier in a same entry as the received device specific identifier, wherein the corresponding device specific identifier is an IP address of a device in the second network domain and the status is a notification of the paging.