A service processing method, comprising: receiving, by an access network device, from a mobility management network element, MME, a bearer setup request message of a voice over long term evolution, VoLTE, service; and rejecting, by the access network device, the bearer setup request message when the access network device determines that long term evolution network signal quality of a terminal of the VoLTE service cannot satisfy the VoLTE service; wherein the access network device determines that long term evolution network signal quality of the terminal of the VoLTE service cannot satisfy the VoLTE service, comprises: the access network device determines that the terminal is in a weak coverage area of the access network device; the rejecting, by the access network device, the bearer setup request message comprises: sending, by the access network device, a response message of the bearer setup request message to a mobility management network element, MME, wherein the response message carries a cause value for a bearer setup failure of the VoLTE service, the cause value is radio resources not available; sending, by the MME, the cause value to a proxy-call session control function, P-CSCF, through a serving gateway, SGW, a packet data network gateway, PGW, and a policy and charging rules function, PCRF; instructing, by the P-CSCF according to the cause value, the terminal to initiate a call in the 2/3G circuit switched domain. receiving, by an access network device, from a mobility management network element, MME, a bearer setup request message of a voice over long term evolution, VoLTE, service; and rejecting, by the access network device, the bearer setup request message when the access network device determines that long term evolution network signal quality of a terminal of the VoLTE service cannot satisfy the VoLTE service; wherein the access network device determines that long term evolution network signal quality of the terminal of the VoLTE service cannot satisfy the VoLTE service, comprises: the access network device determines that the terminal is in a weak coverage area of the access network device; the rejecting, by the access network device, the bearer setup request message comprises: sending, by the access network device, a response message of the bearer setup request message to a mobility management network element, MME, wherein the response message carries a cause value for a bearer setup failure of the VoLTE service, the cause value is radio resources not available; sending, by the MME, the cause value to a proxy-call session control function, P-CSCF, through a serving gateway, SGW, a packet data network gateway, PGW, and a policy and charging rules function, PCRF; instructing, by the P-CSCF according to the cause value, the terminal to initiate a call in the 2/3G circuit switched domain. the access network device determines that the terminal is in a weak coverage area of the access network device; the rejecting, by the access network device, the bearer setup request message comprises: sending, by the access network device, a response message of the bearer setup request message to a mobility management network element, MME, wherein the response message carries a cause value for a bearer setup failure of the VoLTE service, the cause value is radio resources not available; sending, by the MME, the cause value to a proxy-call session control function, P-CSCF, through a serving gateway, SGW, a packet data network gateway, PGW, and a policy and charging rules function, PCRF; instructing, by the P-CSCF according to the cause value, the terminal to initiate a call in the 2/3G circuit switched domain. sending, by the access network device, a response message of the bearer setup request message to a mobility management network element, MME, wherein the response message carries a cause value for a bearer setup failure of the VoLTE service, the cause value is radio resources not available; sending, by the MME, the cause value to a proxy-call session control function, P-CSCF, through a serving gateway, SGW, a packet data network gateway, PGW, and a policy and charging rules function, PCRF; instructing, by the P-CSCF according to the cause value, the terminal to initiate a call in the 2/3G circuit switched domain.