User equipment signaling of customize ringing signal capability

A wireless device, comprising:

• a wireless transceiver;
• and
• a processor coupled to the wireless transceiver and configured with processor-executable instructions to:
• receive from a network a first INVITE message notifying the wireless device of an incoming call;
• determine whether the first INVITE message indicates that the network provides CRS service if the wireless device supports a CRS function;
• include an indication in a response to the first INVITE that the wireless device supports the CRS function in response to determining that the first INVITE message includes an alert information header field indicating that the network provides CRS service;
• receive from the network a second INVITE message notifying the wireless device of a second incoming call;
• determine the second INVITE message indicates that the network does not provide the second CRS service;
• and
• provide a response to the second INVITE message without the alert information header field to initiate a default ring.

A method performed by a processor of a network computing device for providing customized ringing signal (CRS) service by a network, comprising:

• transmitting a first INVITE message to a wireless device informing the wireless device of an incoming call, wherein the first INVITE message includes an indication that the network provides CRS service;
• receiving a response to the first INVITE message from the wireless device;
• determining the response to the first INVITE message indicates that the wireless device supports a CRS function;
• performing a CRS negotiation with the wireless device in response to determining that response to the first INVITE message indicates that the wireless device supports the CRS function;
• completing connection of the incoming call without performing the CRS negotiation in response to determining that response to the first INVITE message does not indicate that the wireless device supports the CRS function;
• transmitting a second INVITE message to a wireless device informing the wireless device of an incoming call, wherein the second INVITE message includes an indication that the network provides CRS service;
• and
• receiving a response to the second INVITE message without an alert information header field to initiate a default ring.

A network computing device for use in a network, comprising:

• a processor coupled to a wireless transceiver and configured with processor-executable instructions to:
• transmit an INVITE message to a wireless device informing the wireless device of an incoming call, wherein the INVITE message includes an indication that the network provides CRS service;
• receive a response to the INVITE message from the wireless device;
• determine whether the response to the INVITE message indicates that the wireless device supports a CRS function;
• perform a CRS negotiation with the wireless device in response to determining that response to the INVITE message indicates that the wireless device supports the CRS function;
• complete connection of the incoming call without performing the CRS negotiation in response to determining that response to the INVITE message does not indicate that the wireless device supports the CRS function;
• transmitting a second INVITE message to a wireless device informing the wireless device of an incoming call, wherein the second INVITE message includes an indication that the network provides CRS service;
• and
• receiving a response to the second INVITE message without an alert information header field to initiate a default ring.