IP, network phone, marketing channel, Relation marketing, Competitive, mature new product.

网络电话，成熟的新产品，营销渠道，关系营销，竞争力。

youdao

IP, network phone, marketing channel, Relation marketing, Competitive, mature new product.

网络电话，成熟的新产品，营销渠道，关系营销，竞争力。

youdao