public static Builder newBuilder(im.turms.plugin.livekit.core.proto.models.SipDTMF prototype) {
        return DEFAULT_INSTANCE.toBuilder()
                .mergeFrom(prototype);
    }
<code>string digit = 4;</code>

@return The bytes for digit.
turms-plugins/turms-plugin-livekit/src/main/java/im/turms/plugin/livekit/core/proto/models/SipDTMF.java