查找和replace的公式

我有一个Excel表,在列A1 ,可以有“IP5521”,或“IP5531”,或“IP5621”或“SIP”,我想如果我看到“IPXXXX”,我把B1 “IPT”,如果我看到“SIP”,我把“SIP”放在B1

下面的function工作,但我需要通配符5522,因为这可能会改变取决于电话

 =IF(J4="IP5522","IPT",IF(J4="SIP","SIP","")) 

=IF(LEFT(J4,2)="IP","IPT",IF(J4="SIP",J4,""))