Avaya 1738 error code resolution

[Anthony Squires]

When a user tries to transfer a call using Avaya Agent he gets this error everytime. I need a resolution to this and any help would be greatly appreciated!

17:42:40 G711MU ssff ps:20
rgn:239 [64.58.238.100]:38170
rgn:1 [64.58.238.216]:2210
17:42:40 xoip options: fax:T38 modemff tty:US uid:0x51227
xoip ip: [64.58.238.216]:2210
17:42:40 idle station 7009176 cid 0x33c0
17:42:40 calltype 4138#, no match
17:42:41 dial
17:42:41 denial event 1738: Conf/xfer unstable calls D1=0x9c3c D2=0x33da
17:42:41 transfer station 7072705 cid 0x33da
17:42:41 hold station 7072705 cid 0x33da
17:42:41 unhold station 7072705 cid 0x33c0
17:42:41 G711MU ssff ps:20
rgn:235 [64.58.238.77]:10092
rgn:1 [64.58.238.216]:2234
17:42:41 xoip options: fax:Relay modemff tty:US uid:0x3415d1

 

[Sean655]

What is the process the agent is following? Do they put the call on hold first and try calling the other party to perform a warm transfer?
What is the agent calling (vdn, station, hunt)?
Has the agent been able to call that extension before? Are other agents able to call the extension without issue?