Press
Trans/Conf or 
.
Dial the Trunk Single Flash or Trunk Double Flash Feature Access code.
Wait for dial tone.
Dial the Centrex feature access code.
Trunk Flash lets you single or double flash a trunk in order to access Centrex features.
Tip: Once a user receives dial tone from the CO (after flashing a trunk), the system cannot restrict dialing.
Trunk Flash is supported for the following types of trunks:
LS/GS CO
E&M
T1DID/TIE
T1 E&M
T1 CO
For analog trunks:
Trunk Flash is supported for both LS and GS trunks on the LS/GS trunk card.
Trunk Flash is supported for LS trunks on all other analog trunk interfaces on the 3300 ICP.
For digital trunks, Trunk Flash is only supported for T1 trunks on the Universal NSU that are running T1 CAS protocol.
MSDN or DASSII trunks do not support Trunk Flash.
DISA callers cannot use Trunk Flash.
To initiate this feature, you must be in talking state on the trunk that is to be flashed with no one on Consultation Hold. You cannot initiate the feature if you are in a conference unless the conference uses the far end's conference capabilities.
A Symbol Wireless phones cannot initiate this feature.
Enter the duration of the single trunk flash or each of the flashes for a double trunk flash in the Flash Timer field of the appropriate Trunk Circuit Descriptor form. For a double flash, the time between flashes is hard-coded at one second.
Enable Trunk Flash Allowed in the Class of Service Options form for both the telephone that will perform the flash and the trunk that will be flashed.
If you intend to use a feature access code in Operation, assign the Trunk Double Flash and Trunk Single Flash codes in the Feature Access Codes form.
If you intend to use a feature key in Operation, program a Single Flash and a Double Flash key in the Multiline Set Keys form or use Superkey (see Feature Keys for more information on Superkey programming).
You can insert a Trunk Flash into a System Speed Call by using the flash character (f or F). You can insert a Trunk Flash into a Personal Speed Call or Speed Call Key by using the Flash key, Trans/Conf key, or Insert Flash softkey. Note that you cannot program a flash into a Speed Call Key in the programming forms.
See the Feature-Phone Matrix (PDF or Microsoft Excel version) for a list of phones that can use this feature.
5550 IP Console
To flash a trunk:
Press Trans/Conf
or Flash.
OR
Flash the switchhook.
Dial the Trunk Single Flash or Trunk Double Flash Feature Access code.
SUPERSET 410, SUPERSET 420, SUPERSET 430, SUPERSET 4015, SUPERSET 4025, SUPERSET 4125, and SUPERSET 4150 telephones; 5010 IP Phone, 5020 IP Phone, 5207 IP Phone, 5215 IP Phone, 5215 IP Phone (Dual Mode), 5220 IP Phone, 5220 IP Phone (Dual Mode), 5312 IP Phone, 5324 IP Phone, 5320 IP Phone, 5330 IP Phone, 5340 IP Phone, 5360 IP Phone, Navigator, TeleMatrix 3000 IP Phone, 5560 IPT, SUPERCONSOLE 1000, and 5540 IP Console:
To flash a trunk:
Press the Single Flash or Double Flash feature key.
5304 IP Phone, 5212 IP Phone and 5224 IP Phone
To flash a trunk while on an outside call:
Press
Trans/Conf or .
Dial the Trunk Single Flash or Trunk Double Flash Feature Access code.
Wait for dial tone.
Dial the Centrex feature access code.
OpenPhone 27
To flash a trunk:
Press 
.
Dial the Trunk Single Flash or Trunk Double Flash Feature Access code.
Wait for dial tone.
Dial the Centrex feature access code.
5235 IP Phone
To flash a trunk:
Press the key you have programmed to Single Flash or Double Flash.
Wait for dial tone.
Dial the Centrex feature access code.
SpectraLink Wireless Telephones
To flash a trunk:
Press FCN then press 1.
Dial the Trunk Single Flash or Trunk Double Flash Feature Access code.
Wait for dial tone.
Dial the Centrex feature access code.
