94 Copyright © 2007 Nokia. All rights reserved.C o n n e c t i v i t yCallback requestsSend a callback requestIf you make a one-to-one call and do not get a response,you can send a request for the person to call you back.To send a callback request from Contacts, scroll to acontact, and select Options > Send callback request.Respond to a callback requestWhen someone sends you a callback request, 1 newcallback request is displayed in the standby mode. SelectShow to open Callback inbox. Scroll to a contact, andpress the call key.ChannelsWhen you are connected to a channel, all members joinedto the channel hear you talking. Up to five channels can beactive at the same time. When more than one channel isactive, select Swap to change the channel you want to talkto.Channels are registered with a URL address. One userregisters the channel URL in the network by joining thechannel the first time.Create your own channel1 Select Options > PTT channels.2 Select Options > New channel > Create new.3 Enter a Channel name.4 Select a Channel privacy level.5 Enter your own nickname in Nickname.6 If you want to add a thumbnail image to the group,select Thumbnail and an image.7 Select Done. When you have created a channel, you areasked if you want to send channel invitations. Channelinvitations are text messages.Join a preconfigured channelA preconfigured channel is a talk group that is set up byyour service provider. Only preconfigured users are allowedto join and use the channel.1 Select Options > PTT channels.2 Select Options > New channel > Add existing.3 Enter the Channel name, Channel address, andNickname. You can also add a Thumbnail.4 Select Done.Respond to a channel invitationTo save a received channel invitation, select Options >Save channel. The channel is added to your PTT contacts,channels view.