Which module of SMS gateway is responsible for message caching and forwarding?

This is cached and retransmitted by the message caching module and the message retransmission module.

1. message cache module: this module is mainly responsible for temporarily storing the received messages for subsequent transmission. Message caching module usually adopts some caching algorithms, such as LRU algorithm or FIFO algorithm, to ensure the effective use of cache space.

2. Message resending module: This module is mainly responsible for trying to resend the message after detecting the message sending failure. The message retransmission module usually adopts some retransmission strategies, such as random retransmission, polling retransmission or timing retransmission, to ensure that the message can be sent successfully in the end.