php 2 sap , how to change sap server port

I set  parameters like this

"logindata"=>array(

"ASHOST"=>"172.18.95.149"  // application server

,"SYSNR"=>"99"    // system number

,"CLIENT"=>"dp"

run application get this message:

Connect_PM  GWHOST=172.18.95.149, GWSERV=sapgw99, SYSNR=90

LOCATION    CPIC (TCP/IP) on local host

ERROR       partner '172.18.95.149:3399' not reached

actually  i want to connect 3299 port,  

i look up /etc/servives file . if we need connect  3299 port,  we'll  set  sapdp99.

so  how to set  GWSERV=sapdp99,

if i modify /etc/servives   sapgw99  3299,   nothing change.   also say  partner '172.18.95.149:3399' not reached