Methods systems, and computer program products for security protocol selection in internet protocol multimedia subsystem networks

A method, comprising:

• receiving, at a registration server, a security protocol identification message from user equipment, wherein the security protocol identification message identifies a list of security protocols supported by the user equipment, wherein the list of security protocols comprises a first protocol and a second protocol;
• sending, prior to receiving a first secured registration request message from the user equipment, a first message from the registration server to the user equipment proposing the first protocol;
• receiving, at the registration server, the first secured registration request message from the user equipment, wherein the first secured registration request message is secured using the first security protocol, wherein the first secured registration request message is received from the user equipment in response to sending the first message from registration server to the user equipment proposing the first protocol;
• determining, at the registration server, that the first secured registration request message cannot be decoded using the first protocol;
• sending, to the user equipment, a second message from the registration server proposing the second protocol;
• and
• receiving, at the registration server, a second secured registration request message from the user equipment, wherein the second secured registration request message is secured using the second protocol.

A non-transitory computer-readable medium comprising instructions, which, when loaded and executed by a processor, cause the processor to perform operations, the operations comprising:

• receiving, at a registration server, a security protocol identification message from user equipment, wherein the security protocol identification message identifies a list of security protocols supported by the user equipment, wherein the list of security protocols comprises a first protocol and a second protocol;
• sending, prior to receiving a first secured registration request message from the user equipment, a first message from the registration server to the user equipment proposing the first protocol;
• receiving, at the registration server, the first secured registration request message from the user equipment, wherein the first secured registration request message is secured using the first security protocol, wherein the first secured registration request message is received from the user equipment in response to sending the first message from registration server to the user equipment proposing the first protocol;
• determining, at the registration server, that the first secured registration request message cannot be decoded using the first protocol;
• sending, to the user equipment, a second message from the registration server proposing the second protocol;
• and
• receiving, at the registration server, a second secured registration request message from the user equipment, wherein the second secured registration request message is secured using the second protocol.