Seamless voice call initiation

A device for wireless communication connected to a first network, comprising one or more processors that are configured to:

• initiate an Internet Protocol Multimedia System (IMS) session establishment for a wireless device, wherein the first network supports the IMS session establishment;
• configure the IMS session establishment using a Protocol Data Unit (PDU) session modification request;
• and
• complete the IMS session establishment without a fallback to a second network based on a comparison of a first network condition of the first network and a second network condition of the second network for the IMS session establishment, wherein the second network is different from the first network.

A system of one or more wireless communication networks, comprising:

• a first access node in a first communication network;
• and
• a second access node in a second communication network that is different from the first communication network, wherein the second access node is configured to:
• initiate, in the second communication network, an Internet Protocol Multimedia System (IMS) session establishment for a wireless device, wherein the second communication network supports the IMS session establishment;
• configure the IMS session establishment using a Protocol Data Unit (PDU) session modification request;
• and
• complete the IMS session establishment without a fallback to the first communication network based on a comparison of a first network condition of the first communication network and a second network condition of the second communication network for the IMS session establishment.